How to Recover From Inbox Overload: 30-Day Reset Plan

Google and Yahoo both tightened their bulk-sender requirements in 2024 — mandatory one-click unsubscribe, authenticated domains, low spam-complaint thresholds — which means the senders flooding your inbox today are now legally bound to make leaving them painless. That changes the recovery math for anyone staring at thousands of unread messages: the cleanup that used to take a week of evenings can be done in a single weekend with the right sequence. I have run three inbox-bankruptcy resets on my own accounts over the last decade and watched what holds versus what slides back within a month. Here is how to recover from inbox overload in 30 days: the one-time deep clean, the unsubscribe sweep, the filters that stop the bleed, and the processing rhythm that keeps the inbox calm long after the dopamine of “0 unread” fades.

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TL;DR: the 30-day recovery plan

Recover from inbox overload in six steps over 30 days: declare bankruptcy on the existing backlog (day 1), bulk-archive everything older than 30 days (day 1), run a single-session unsubscribe sweep (day 2), batch-delete the worst-offender senders (week 1), set up filters that route low-value mail past the inbox (week 1), then commit to a processing rhythm for the remaining three weeks. Archive rather than delete. Pair the cleanup with the habit, or the inbox is back to where it was within six weeks.

The shortest version of the plan, with no extra context:

Day 1 — Declare and archive. Send a short out-of-office that flags older mail will not be answered individually. Select all mail older than 30 days in your primary inbox and archive it.
Day 2 — Unsubscribe sweep. Identify the 50–200 senders that account for most of the inbox volume. Unsubscribe in one focused session.
Week 1 — Sender cleanup + filters. Batch-delete the residue from senders you unsubscribed from. Add filters that route receipts, calendar invites and notifications past the inbox.
Weeks 2–3 — Stabilise. Let the filter changes settle. New mail volume should drop visibly by the end of week three.
Week 4 — Rhythm. Commit to one daily processing window — touch-it-once, two-minute rule, batched at two or three points in the day. Treat the inbox the same way you treat email after a holiday: as something to clear, not something to live in.

The rest of this guide walks each step in detail, with the exact UI flows for Gmail and Outlook, and with the failure modes I have hit personally on previous resets.

Why inboxes overflow in 2026

Inboxes overflow because the average professional now receives more than 120 emails a day, most of which are not personal correspondence but newsletters, notifications, receipts and automated platform messages. The volume scales with every new SaaS signup, every order confirmation, every social network — and unlike spam, none of it is filtered out by the provider, because it is technically mail you opted into.

The frustrating part of modern inbox overload is that almost none of it is malicious. Spam filters from Gmail, Outlook and Apple Mail handle the bad-faith mail well — Google’s own help documentation confirms Gmail auto-deletes spam after 30 days, and Outlook applies the same 30-day window to its Junk Email folder. What lands in the inbox is technically legitimate: a receipt from a checkout six months ago, a Slack digest you forgot to disable, a product update from a tool you tried once, a newsletter you signed up for at a conference in 2023.

Multiply that across a few hundred services and the math becomes obvious. Every new account adds two or three recurring senders. Three years of normal SaaS usage adds roughly 150 of them. None will unsubscribe themselves. The inbox is not broken; it is reflecting a backlog of small commitments you never consciously stacked.

That diagnosis matters because it changes the fix. You are not fighting spam — you are unwinding subscriptions. The tools and the sequence below are built for that, not for filter tightening.

Step 1: Declare inbox bankruptcy

Inbox bankruptcy is the deliberate decision to give up processing a backlog message by message and archive it in one action, then start fresh from a clean inbox. The term was coined in 2004 by productivity writer Merlin Mann on 43folders.com and later covered by the New York Times. On a personal inbox it carries near-zero social cost if you archive rather than delete and post a brief out-of-office explaining the reset.

Merlin Mann’s original write-up on 43folders described “email DUI” as the moment a backlog grows so large that processing it linearly becomes irrational [1]. The New York Times picked the concept up four years later in a feature on email overload at large companies, where senior executives openly admitted to mass-archiving thousands of messages and asking colleagues to re-send anything genuinely urgent [2]. The pattern has held in the two decades since because the underlying constraint has not changed: attention is finite, and the cost of processing a stale message is the same as processing a fresh one.

To declare bankruptcy on a personal inbox cleanly:

Set an out-of-office note — keep it brief and honest. “I am resetting my inbox after a long backlog. If you sent me something in the last few weeks that still needs a reply, please resend the short version — I will not be able to work through the archive individually.” That single line cuts the social cost to zero. The people who genuinely need an answer follow up; the rest were already gone.
Archive, do not delete. Gmail, Outlook and Apple Mail all keep archived mail fully searchable for the life of the account. The bankruptcy is about clearing the visual and emotional load of an overflowing inbox, not destroying records. A contract or invoice you missed is still findable later.
Set a clear cut-off. I use “anything older than 30 days” as the line — recent enough that the senders who needed me know they were ignored, old enough that the bulk of accumulated noise is safely on the far side. Some resets go more aggressive (older than 7 days) when the backlog is in the thousands; the principle is the same.

The hardest part of bankruptcy is psychological, not technical. The first time I did it on my main Gmail in 2019 I sat with the “Select all” checkbox ticked for about ten minutes before clicking Archive on roughly 14,000 messages. Within two weeks I had received exactly four follow-ups asking me to resend, all of which I answered in under a minute. The other 13,996 had not been waiting on me at all.

Step 2: Bulk-archive everything older than 30 days

In Gmail, search “older_than:30d in:inbox”, click the select-all checkbox at the top of the result list, then click “Select all conversations that match this search” to extend selection beyond the visible page, and click Archive. In Outlook on the web, use the Filter menu in the inbox to filter by date, select all results, and click Archive. Both operations take seconds and are reversible from the All Mail / Archive folder for as long as the account exists.

The exact flow in Gmail web, which I have run three times across the last decade:

In the Gmail search bar, type older_than:30d in:inbox and press Enter. Adjust the window if your backlog is shorter (older_than:7d) or longer (older_than:90d).
Click the Select checkbox at the top-left of the result list. Gmail selects all visible messages and shows a banner: “All 50 conversations on this page are selected.” Click the link “Select all conversations that match this search” to extend selection across every page.
Click the Archive button (the box-with-arrow icon, not the trash). Gmail confirms how many conversations were archived. The action is logged and reversible: archived messages remain in All Mail and surface in any future search.

The exact flow in Outlook on the web, which behaves identically in the new Outlook for Windows:

Open the Inbox folder.
Click the Filter dropdown at the top right of the message list, choose Sort by, then change the sort to Date (oldest). Scroll to the boundary date and click the first message older than your cut-off.
Shift-click the oldest message to select the entire range. Right-click and choose Archive. Microsoft’s archive behavior keeps the messages in an Archive folder, fully searchable.

Both providers complete the operation in a few seconds regardless of message count. The visual relief of a 5-message inbox after weeks of staring at five-figure unread counts is genuinely useful — the rest of the cleanup is easier when there is no longer a wall of noise to scroll past.

For more granular bulk-archive workflows on Gmail specifically — across labels, by sender, by date — our guide on how to archive emails in bulk covers the variants you may need on an account with heavy label use.

Step 3: Unsubscribe in bulk

A bulk unsubscribe sweep is the single highest-leverage step in inbox overload recovery, because the same 50 to 200 senders typically account for 70 to 90 percent of inbound volume. Manual unsubscribing one-by-one through provider UIs takes several hours; a dedicated subscription manager like Leave Me Alone surfaces every sender in one view and processes them in a single session. Gmail and Yahoo’s 2024 bulk-sender rules require one-click unsubscribe to actually work, so the legal infrastructure is now on your side.

The 2024 sender requirements from Google and Yahoo changed the math of bulk unsubscribing. Both providers now require any sender with more than 5,000 messages per day to a Google or Yahoo address to support a one-click unsubscribe header and process the request within two business days [4]. In practical terms, that means the senders most likely to be flooding your inbox are the senders most likely to honor an unsubscribe — they have no choice if they want to keep reaching anyone.

A practical sweep sequence:

Inventory the senders. In Gmail, sort the inbox by sender (or use search operators like from: and the Filter messages like these option from any message menu). In Outlook, the From column header is sortable. The pattern that surfaces is always the same: a long tail of one-off senders and a short head of 50 to 200 repeat offenders.
Process the head, not the tail. The tail unsubscribes itself over time — nobody sends you a single message a year unless you specifically asked them to. Focus the session on the senders contributing more than three messages a month.
Use a dedicated tool for the speed gain. Working through 200 senders one at a time in Gmail or Outlook takes between three and six hours. A dedicated unsubscribe service surfaces every subscription in one list with a single button per sender. I use Leave Me Alone for this — it scans the account, groups subscriptions by sender, and lets you unsubscribe with one click each. The first session typically takes 20–40 minutes for a backlog of 150–300 subscriptions, versus an afternoon of manual work.

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If you prefer the manual route, our guide on the best way to mass unsubscribe compares the provider-native flows and dedicated services side by side, with the exact click counts for each.

Step 4: Sender-level cleanup

After the unsubscribe sweep, dozens of senders will still have residual mail sitting in the archive or inbox. The fastest cleanup is sender-level batch deletion: filter the entire inbox by a sender, select all results, delete in one action. Gmail’s “from:” search operator and Outlook’s right-click “Find related → Messages from sender” both produce a single-sender view in one click. Process the top 20 senders and the visible backlog drops by another order of magnitude.

Unsubscribing stops the future flow but does nothing about the residue already sitting in the account. A sender-level cleanup pass clears that residue in a single session.

The flow on Gmail:

From any message, click the sender name to open the contact card, then click All from this sender. Alternatively, type from:sender@example.com in the Gmail search bar.
Click the Select checkbox, then Select all conversations that match this search.
Click Delete (the trash icon). The messages move to Trash, where Gmail auto-purges after 30 days.

The flow on Outlook on the web:

Right-click any message in the sender list. Choose Find related → Messages from sender. Outlook filters to every message from that sender in the entire mailbox.
Press Ctrl+A to select all results, then click Delete.

Our guide on how to delete all emails from one sender walks the operator syntax and bulk-select shortcuts across Gmail, Outlook, Yahoo and Apple Mail, including the edge cases where the provider caps selection at the first page of results.

The right targets for sender-level deletion are clear: any sender from whom you unsubscribed in step 3, any sender whose mail you never opened (Gmail shows a small unread-only filter to identify these quickly), and any sender from a service you no longer use. Skip personal correspondents and transactional senders (banks, employers, government); the goal is volume removal, not memory loss.

Step 5: Set up filters and rules to prevent re-overflow

Filters route incoming mail past the inbox automatically — into labels, folders or the archive — based on sender, subject or content. Setting up six to ten filters covering the common categories (receipts, calendar invites, social notifications, automated tool alerts) prevents 30 to 50 percent of new mail from ever reaching the visible inbox. Gmail filters live under Settings → Filters and Blocked Addresses; Outlook rules live under Settings → Mail → Rules. Both run automatically and require no daily attention.

The categories worth filtering for almost everyone:

Receipts and order confirmations. Subject contains “receipt”, “order confirmation”, “invoice”, “your order”. Route to a Receipts label or folder, skip the inbox.
Calendar invites and confirmations. From calendar-notification@google.com or similar. Most users want these archived after the event passes — a filter that skips the inbox keeps them out of view but searchable when needed.
Social network notifications. From notifications@linkedin.com, notification@facebookmail.com, etc. Almost no one needs these in the inbox; a label-and-archive filter handles them.
Automated tool alerts. Slack digests, GitHub notifications, Trello reminders. Filter by sender, route to a tool-specific label.
Newsletters you want to keep but not in the inbox. Filter to a Read Later label. This works particularly well when paired with a weekly batch reading session.

The setup is one-time. Gmail and Outlook both apply filters at delivery time, so the inbox stays clean from the moment the filter exists.

For the Gmail-specific filter UI and the syntax for the more aggressive routing patterns (filter by mailing list, by has-attachment, by size), our guide on setting up Gmail filters to delete automatically covers the exact configuration steps and the patterns to avoid (filters that catch too much legitimate mail).

Step 6: Choose a processing rhythm

A processing rhythm is the daily routine that prevents the inbox from drifting back into overload. Three rhythms hold up in practice: touch-it-once (decide on every message the first time you open it), the two-minute rule (any reply that takes under two minutes gets sent immediately; everything else is filed or scheduled), and batched windows (process the inbox at two or three fixed times per day instead of continuously). The right one depends on volume and role, but any rhythm beats no rhythm.

The reason most inbox bankruptcy resets fail at the six-week mark is not the cleanup — it is the absence of a routine to replace the open-tab-all-day pattern that caused the overload in the first place. Three rhythms work for different volumes and roles.

Touch-it-once. Every time you open a message, you make the decision then: reply, archive, delete, schedule, delegate. Opening it without deciding counts as a failure. Best for inboxes under 30 new messages a day, where the cost of re-reading is higher than the cost of deciding on the spot.

The two-minute rule. If a reply takes under two minutes, send it now — the cost of re-opening and re-reading exceeds the cost of just writing the reply. If the reply takes longer, file the message into an @Action label or folder and schedule a block of time for the longer replies. Originally from David Allen’s Getting Things Done methodology, this is the rhythm that holds up best on inboxes in the 30–100 messages-per-day range.

Batched windows. Instead of treating the inbox as a notification stream, open it at two or three fixed times per day — typically morning, after lunch, end of day — and close it the rest of the time. Most knowledge work does not require sub-hour email response times; pretending otherwise is what drove the overload. Batching is the rhythm to use if the touch-it-once volume is overwhelming, because batching plus the unsubscribe sweep typically drops the daily volume into the touch-it-once range within a month.

The choice matters less than the commitment. Pick one and run it for the four-week stabilisation period. Our inbox cleanup routine for every week walks the maintenance habit that pairs with whichever rhythm you choose.

Tools that help

Two categories of tool earn their place in inbox overload recovery: a dedicated unsubscribe service (Leave Me Alone is the one I rely on) for the bulk subscription sweep, and a unified-inbox client (Mailbird on Windows, equivalents on Mac) if you are managing multiple accounts. Everything else — bulk archive, filters, rules, search — is well-served by the native Gmail or Outlook interface and adds no value to delegate.

I am skeptical of “inbox management” tools as a category. Most of them solve a problem you do not have or layer a new UI over capabilities your existing client already has. Two categories genuinely earn the install.

A subscription manager — Leave Me Alone. The bulk unsubscribe step is the one place where a dedicated tool collapses several hours of manual work into a single session. Leave Me Alone scans the inbox, surfaces every subscription sender in one list, and processes one-click unsubscribes in batch. Worth it on any account where the backlog is more than 50 senders; for a smaller backlog, the manual route is fine.

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A unified-inbox client — Mailbird (Windows) or equivalents. If part of the inbox overload is structural — three or four separate accounts each carrying their own backlog — a unified client that surfaces all of them in one view changes the math. Recovery from a multi-account overload is much harder when you have to repeat the cleanup four times. Mailbird on Windows handles the unified inbox cleanly; on Mac the closest equivalents are Mimestream (for Gmail accounts) and Spark (for mixed accounts). Our Mailbird 2026 review covers the unified-inbox workflow in depth.

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Skip the rest. The “inbox zero coach” apps, the AI summarisers, the in-line snooze plugins — they solve a problem you can fix with one bulk archive and a six-filter setup. Save the install slots for tools that do something your client genuinely cannot.

Recovery timeline: realistic expectations

A realistic recovery timeline is one hour to declare bankruptcy and bulk-archive, one focused session of 20 to 60 minutes to run the unsubscribe sweep, three or four hours over the first week for sender cleanup and filter setup, then 21 to 28 days of stabilisation before the inbox feels truly calm. The volume drop from the unsubscribe sweep is visible within seven to ten days; the behaviour change from the new processing rhythm takes the full four weeks to lock in.

The honest version of the timeline, from running this on my own accounts and watching others do it:

Hour 1 — Bankruptcy declared, bulk archive complete. Visible inbox drops from thousands to single digits. Emotional relief is real and immediate.
Day 2, 30–60 minutes — Unsubscribe sweep done. Effects are not yet visible; the senders need 24–72 hours to process the unsubscribes.
Week 1 — Sender cleanup and filters in place. Daily new-mail volume starts to drop, typically 20 to 40 percent by end of week one.
Weeks 2–3 — Volume continues to drop. New mail per day stabilises 50 to 70 percent below the pre-reset baseline. Some senders that ignored the unsubscribe (mostly internal-only platforms with no public unsubscribe path) get a sender-level block or a filter-to-archive.
Week 4 — Processing rhythm locked in. Inbox is genuinely calm. Daily processing takes 10 to 20 minutes instead of an hour. The reset holds.
Month 2 onwards — Maintenance only. Weekly five-sender unsubscribe pass keeps the inbox from re-creeping. Filters need occasional pruning. The deep cleanup does not need repeating for at least 12 months on a personal account.

The number that surprises people the most is how much of the volume comes back if any step is skipped. Skipping the unsubscribe sweep alone produces a six-week regression to roughly 70 percent of the original overload. Skipping the processing rhythm change produces a three-month regression to the original level. The cleanup and the habit have to ship together.

Where this approach stops working

There are honest limits to what an inbox overload recovery plan can do. Naming them stops you spending effort in the wrong place.

Corporate compliance inboxes are different. If you are operating under a retention policy, legal hold or eDiscovery regime, mass-archiving may breach internal rules. Check with IT before clicking Archive on anything that could have legal weight.
Some senders ignore unsubscribes. Most legitimate senders honor one-click unsubscribe — but a long tail of internal platforms, automated low-volume tools and questionable bulk senders do not. For these, the answer is a filter-to-archive rule or a sender block.
Reset frequency matters. Repeating bankruptcy every six weeks because the routine never installed is the failure mode to watch for. Recovery is a one-time event paired with a habit, not a recurring chore.
The plan does not fix relational debt. If the overload includes messages from people you actually owed a reply, the bankruptcy archives them but does not solve the relationship cost. The honest move is a follow-up note to the handful of people you remember owing.
Filter aggression has a ceiling. Filters that catch too much legitimate mail produce the same loss-of-trust problem as a too-eager spam filter. Start with conservative filters and tighten over weeks, not in one session.

The verdict and common pitfalls

The strongest approach is a one-time deep cleanup paired with a permanent processing rhythm change, not repeated cleanups without the habit shift. Run all six steps in a single weekend, then commit to a four-week stabilisation period. Best for personal Gmail, Outlook, Yahoo and Apple Mail accounts where the goal is a calm, maintainable inbox; skip if you are on a corporate inbox under compliance constraints. The common pitfalls — skipping the unsubscribe sweep, deleting instead of archiving, never installing the rhythm — cause the recovery to fail predictably at the six-week mark.

Working through this on three of my own accounts and watching it on several others, the playbook that holds is short:

Pair the cleanup with the habit, always. A bankruptcy without a new rhythm is a six-week postponement, not a recovery.
Archive, never delete. The visual load is what matters; the retrievability is what protects you.
Use a dedicated tool for the unsubscribe sweep only. Everything else (archive, filters, rules) is fine in the native client.
Set up filters in week 1, not week 4. Every day without the filters is another day of low-value mail re-cluttering the freshly clean inbox.
Trust the 30-day stabilisation. The volume drop from unsubscribes is visible at day 7 to 10; the full effect of the new rhythm takes four weeks to lock in.

Best for: personal Gmail, Outlook, Yahoo and Apple Mail accounts where the daily mail volume is between 50 and 300 messages and the backlog has reached a state that feels impossible to process linearly. Skip if: you are on a corporate inbox under retention rules, legal hold or compliance policy — the archive and delete steps both need to be cleared with IT first.

Alexis Dollé

Founder & Editor

Alexis Dollé, email expert for 10+ years. Founder of Email Tools. I have cleared three inbox-bankruptcy resets on my own accounts and watched what holds versus what slides back — I test every email client and utility myself, then write about them the way I would explain them to a friend. No marketing fluff, no sponsored rankings, every claim sourced.

Sources & references

Merlin Mann — “Email DUI” (origin of the inbox bankruptcy concept). Published April 2004 on 43folders.com, framing the moment a backlog becomes impossible to process linearly. Accessed 2026-05-24. 43folders.com/2004/04/27/email-dui
The New York Times — “Lost in E-Mail, Tech Firms Face Self-Made Beast” by Matt Richtel. Documents inbox overload at major technology companies and the practice of mass-archiving as a coping mechanism. Accessed 2026-05-24. nytimes.com/2008/06/14/technology/14email.html
Google — Mark or unmark Spam in Gmail. Confirms 30-day auto-deletion of Spam folder contents. Accessed 2026-05-24. support.google.com/mail/answer/1366858
Google — Email sender guidelines (2024 bulk sender requirements). Documents the one-click unsubscribe requirement and spam complaint thresholds for senders exceeding 5,000 messages/day to Gmail. Accessed 2026-05-24. support.google.com/mail/answer/81126
Microsoft — Filter junk email and spam in Outlook. Documents the 30-day Junk Email retention policy and the Archive, Safe Senders and Blocked Senders configuration. Accessed 2026-05-24. support.microsoft.com
Email Tools — How to archive emails in bulk. email-tools.me/posts/how-to-archive-emails-in-bulk/
Email Tools — Best way to mass unsubscribe. email-tools.me/posts/best-way-to-mass-unsubscribe/
Email Tools — How to delete all emails from one sender. email-tools.me/posts/how-to-delete-all-emails-from-one-sender/
Email Tools — Gmail filter delete automatically. email-tools.me/posts/gmail-filter-delete-automatically/
Email Tools — Inbox cleanup routine weekly. email-tools.me/posts/inbox-cleanup-routine-weekly/
Email Tools — Mailbird review 2026. email-tools.me/posts/mailbird-review-2026/

Frequently asked questions

What is inbox bankruptcy and is it safe to declare it?

Inbox bankruptcy is the deliberate decision to give up trying to process a backlog of unread email and archive it in one go, then start fresh. The term was popularised in 2004 by productivity writer Merlin Mann on 43folders.com and picked up by the New York Times and the Atlantic. It is safe to declare it on a personal inbox if you archive rather than delete — archived mail is still searchable, and the people who genuinely need an answer will follow up. Pair it with an out-of-office note that says explicitly that older messages will not be answered individually, and the social cost stays near zero.

How long does it take to recover from inbox overload?

Roughly 30 days from a deliberate reset to a calm, maintainable inbox. The first hour buys you the bulk archive and a clean slate. The first week installs the unsubscribe sweep and the basic filters. The second and third weeks let the filter changes settle and the volume of inbound mail drop. The fourth week is where you lock in a processing rhythm — touch-it-once, two-minute rule, batched windows — and stop reverting to the old pattern. Skip any of those phases and the inbox creeps back to where it was within six weeks.

Should I archive or delete when recovering from overload?

Archive, almost always. Gmail, Outlook and Apple Mail all keep archived messages searchable for as long as your account exists. Deleting saves no time during the reset itself and costs you the option of retrieving a contract, an invoice or a real-person message you missed. The only exception is provider-side junk and promotional categories that are already auto-purging — Gmail and Outlook both auto-delete spam after 30 days according to their own documentation, so dragging promotional mail to spam during the reset is a defensible shortcut. Keep transactional and personal mail archived, never deleted.

What is the difference between inbox zero and inbox bankruptcy?

Inbox zero is the daily maintenance state — an inbox processed down to zero unread or zero items pending action, on a regular cadence. Inbox bankruptcy is the one-time reset that gets you to a starting point from which inbox zero becomes plausible. You declare bankruptcy when the backlog is so large that processing it message by message would take days, then you adopt an inbox-zero-style routine to keep it from happening again. Bankruptcy without the routine just resets the clock on the next overload.

Do I need a tool, or can I recover from inbox overload manually?

You can do the bulk archive and the filter setup manually in any major email client — Gmail, Outlook and Apple Mail all expose select-all-then-archive workflows in two or three clicks. Where a dedicated tool earns its place is the unsubscribe sweep: working through 200 promotional senders one at a time in a webmail UI takes several hours, while a service like Leave Me Alone surfaces every subscription in a single view and processes them in a single session. For the rest of the recovery plan — filters, rules, processing rhythm — your existing email client is enough.

How do I stop the inbox from re-overflowing after the reset?

Three habits, all small. First, a weekly five-sender unsubscribe pass — five a week is 260 a year, and bulk senders are now legally required under 2024 Gmail and Yahoo sender rules to honor a one-click unsubscribe. Second, a daily two-minute rule for new mail: if a reply takes under two minutes, send it now; if not, file or schedule. Third, filters on the senders you cannot unsubscribe from but do not need to read immediately — they skip the inbox and collect in a labeled folder you check on your own schedule. The three together hold the line.

Related: How to archive emails in bulk — the bulk-archive workflows in depth. Best way to mass unsubscribe — the unsubscribe sweep step compared. Inbox cleanup routine weekly — the maintenance habit that holds the recovery. Mailbird review 2026 — the unified-inbox client for multi-account overload.