Posteo is the email service that won’t recognise you at the door — and that’s the point. Berlin-based since 2009, run by a tiny team, priced at €1 a month, paid in cash if you want it, hosted on 100% wind and hydro power in a Frankfurt data centre. In February 2026 Posteo shipped two notable changes: end-to-end S/MIME encryption inside the webmail (independently audited) and a doubling of the included storage from 2 GB to 4 GB. To disambiguate up front: this review is about Posteo (posteo.de), the German privacy mailbox provider — not “Posteo” as a brand name in any other industry, and not a desktop email client. Posteo is an email host: you get a mailbox at @posteo.net (or one of nine other TLDs), and you read it with any IMAP client of your choosing. I created a test account, paid for two months, set it up in Thunderbird and on iOS Mail, sent PGP-encrypted email through it, and stress-tested the things people argue about online — anonymity, custom domains, mobile experience, and the question of whether €1/month buys a real mailbox or a privacy-themed toy.
TL;DR — Verdict at a Glance
Posteo in 2026 is the best-value privacy mailbox on the market for users who want a real IMAP/SMTP account under German jurisdiction, paid anonymously, with PGP and S/MIME end-to-end encryption available. One plan, €1/month, 4 GB storage, two aliases, anonymous cash-by-mail payment, 100% renewable energy hosting. No first-party apps (use Thunderbird, Apple Mail, K-9 — any IMAP client). No custom domain support, ever — that is a deliberate anonymity choice, not an oversight. If you need custom domains, mobile-first apps, or a bundled VPN/Drive suite, Posteo is not the right tool.
Best for: Privacy-conscious solo users, journalists, activists, lawyers, and anyone who wants a serious mailbox at the lowest serious price under EU/German law. Also: people who care that their email runs on actual renewable energy rather than greenwashed carbon offsets. The natural buyer is someone who already uses Thunderbird or Apple Mail and wants a privacy-first IMAP account to plug into it.
Skip if: You need a custom domain (Posteo deliberately does not offer this — use Mailbox.org or Fastmail instead). You want first-party mobile apps with push notifications (Proton Mail and Tuta have those; Posteo does not). You need a business plan with team admin, shared mailboxes, or SSO. You want the bundled-suite experience (Proton bundles VPN, Drive, Calendar, Pass).
Pricing summary: €1/month base, billed 1–24 months in advance, paid by SEPA, bank transfer, PayPal, credit card, or anonymous cash sent in an envelope to the Berlin office. 4 GB storage and two aliases included. Storage upgrades and extra aliases are paid add-ons priced transparently. No free tier, no free trial.
Setup and Onboarding
Posteo signup takes about three minutes and asks for nothing beyond a desired username and a password. No name, no phone, no recovery email, no captcha that tracks you. Payment is selected after the mailbox is created, deliberately decoupled from account creation so the payment can be made anonymously by post if you want. Connecting to Thunderbird, Apple Mail, or K-9 takes the standard IMAP/SMTP credentials — Posteo publishes the exact server settings on a single page.
I created a test mailbox at username@posteo.net. The signup form asked for a username, a password (with a real-time entropy meter), and which of the ten available TLDs I wanted (@posteo.net, .de, .org, .eu, .me, .at, .ch, and a few more). That was it — no email recovery field, no phone, no name. The mailbox was live in under a minute. The payment screen appeared after, with a clear note that I could pay by bank transfer, SEPA, PayPal, credit card, or cash sent in an envelope. I paid €2 for two months by SEPA and the mailbox unlocked immediately; for the cash route, Posteo’s site explains the exact process (put the cash in a sealed inner envelope with your username, mail it to Berlin, no return address required).
IMAP/SMTP setup in Thunderbird took ninety seconds. Posteo publishes a single settings page with the server addresses (posteo.de on the IMAP/SMTP ports 993 and 465), and Thunderbird’s autodiscovery picked them up correctly. On iOS Mail I added the account manually using IMAP — also clean, also fast. No first-party Posteo app exists for either platform, which is deliberate: Posteo’s argument is that any half-decent IMAP client (Thunderbird, K-9 Mail, FairEmail, Apple Mail) is more privacy-preserving and better-maintained than a small in-house app the team cannot keep up to date.
The one operational detail that catches new users: Posteo does not offer custom domains at all. There is no upgrade tier that adds them, no enterprise plan, no workaround. If your test of a mailbox provider is “can I run me@mydomain.com here”, Posteo will fail it. That is a deliberate anonymity choice — custom domains leak ownership signals through WHOIS and DNS — but it is also the most common deal-breaker for prosumer buyers.
Design and Daily Feel
Posteo’s webmail is a calm, deliberately minimal interface built on RoundCube principles. No JavaScript is required to read mail — a feature unique among major paid providers in 2026, and a real win for users on locked-down corporate browsers or paranoid Tor sessions. The UI feels closer to 2015 than to 2026 if you compare it to Proton’s app, but it is fast, predictable, and never asks you to dismiss a marketing modal.
After a week of daily use I stopped noticing the webmail interface, which is the highest compliment you can give a mail client. The three-pane layout (folders left, message list middle, message body right) is standard. Keyboard shortcuts cover the routine actions. The compose window is plain. PGP encryption shows up as a checkbox you tick before sending, with key management that lives in Settings → Crypto. The S/MIME flow added in February 2026 is similarly minimal — you generate or import a certificate, the lock icon appears on the compose, you ship encrypted mail.
What you do notice is what is absent. No conversation view (Posteo is folder/message-oriented, not thread-oriented like Gmail or Spark). No AI compose, no smart suggestions, no priority inbox. No banner ads, ever. No tracking pixels rendered. No external resources loaded unless you explicitly click “Show external images”. The webmail will run in a JavaScript-disabled browser, which I tested with NoScript fully blocking — message reading, folder navigation, and basic compose all worked. The contact and calendar panels lose some interactivity, but the core email function does not.
If you live inside a heavy mail client like Apple Mail or eM Client, the webmail aesthetic is irrelevant — you’ll see it once a quarter when you log in from a different machine. If you’re a webmail-first user, the Posteo interface will feel sparse next to Proton or Fastmail. That sparseness is the cost of a JavaScript-light, privacy-preserving frontend.
Privacy, Encryption, and Anonymity
Posteo’s privacy posture has four real teeth: anonymous signup and payment (cash by mail accepted), header stripping (your IP address is removed from every outgoing email), end-to-end encryption with PGP since 2014 and S/MIME since February 2026, and an optional encrypted mailbox where the entire mailbox is encrypted at rest with your password — so even Posteo cannot read it. All of this runs under German jurisdiction with BSI TR-03108 v2 secure-email-transport certification.
The anonymous-signup story is the part I find most underrated. You can create a Posteo mailbox without ever giving a real name, a phone number, or a backup email. You can pay €12 in cash by mailing a sealed envelope to Berlin. The mailbox payment ledger is architecturally decoupled from the mailbox itself — Posteo publishes how this works in its transparency pages — so a court order requesting “who pays for this mailbox” returns no useful link to a human identity if you paid by cash. This is materially different from any US-based provider, and stricter than most EU competitors that require a credit card or PayPal account at signup.
Header stripping is the quiet feature most users never think about. By default, when you send an email through almost any provider, the recipient’s mail headers contain the IP address you sent from — which leaks your geographic location and often your ISP. Posteo strips this header on every outgoing email, replacing your IP with Posteo’s server IP. This was confirmed by independent security analyses and is the same feature ProtonMail and Tuta provide.
The encryption layer has three tiers. PGP in the webmail (since 2014) is the standard option for users who already manage keys. S/MIME in the webmail (since February 2026, independently audited) is the corporate-friendly option that works with Outlook S/MIME ecosystems. The “crypto mailbox” toggle is the option that matters for stored mail: when enabled, your entire mailbox is encrypted at rest with your account password, so a server compromise or legal demand returns ciphertext. Inbound encryption is the bonus: any unencrypted email arriving at your mailbox can be automatically encrypted with your public key before being stored.
The German jurisdiction angle matters more in 2026 than it did three years ago. Posteo operates under the German Telekommunikationsgesetz (TKG) and the Bundesdatenschutzgesetz (BDSG), both of which apply GDPR strictly. The servers are in Frankfurt. The BSI certification (Germany’s federal cybersecurity agency) under TR-03108 v2 covers secure email transport — a specification that mandates TLS, DANE, and a documented operational security posture. For users worried about US CLOUD Act reach (which extends to any US-controlled provider regardless of where data sits), having a mailbox under purely German control is the cleanest jurisdictional answer.
Sustainability — the only mailbox running on wind
Posteo runs on 100% renewable energy from Green Planet Energy (formerly Greenpeace Energy), a Greenpeace-certified provider sourcing from wind and hydro stations in Austria and Germany. The Frankfurt data centre launched in 2020 with Posteo sponsoring the green energy integration. The company has abstained from business flights since 2009, gives employees extra vacation days for taking trains instead of flying, and uses FSC-certified furniture, GLS Bank for customer accounts, and Umweltbank for company savings.
This section deserves its own H2 because no other privacy mailbox can credibly make these claims. Most “green hosting” claims are carbon-offset trickery — the provider pays a third party to plant trees somewhere, the data centre still runs on the same fossil-fuel grid mix. Posteo runs on actual renewable energy from an actual Greenpeace-affiliated provider that refuses to label coal or nuclear as green. The Frankfurt data centre integration was sponsored with €25,000 from Posteo in 2018 specifically to bring the facility onto green power.
The day-to-day sustainability practices read like an idealist’s manifesto and are mostly verifiable. Daily organic vegetarian lunches for the staff. No business flights, ever. Train-bonus vacation days for employees. A €50/month subsidy since September 2023 for employees’ private green energy contracts at home. Charitable giving of €77,500 in 2025 alone to UNICEF, Doctors Without Borders, and Reporters Without Borders — bringing lifetime donations past €584,000.
For users to whom this matters, Posteo is unmatched. For users who don’t care, it’s a curiosity. But unlike the marketing-led sustainability claims of larger tech companies, Posteo’s are documented, audited, and visible on the company’s public sustainability page year after year.
Calendar, Contacts, and Mobile
Posteo includes three calendars, full contacts, and notes — all synced via standard CalDAV and CardDAV. There are no first-party mobile or desktop apps. The supported clients are anything that speaks IMAP/SMTP/CalDAV/CardDAV: Thunderbird (with Lightning calendar), Apple Mail and Calendar, K-9 Mail, FairEmail, DAVx5 on Android, eM Client on Windows. Push notifications work on Apple Mail (IMAP IDLE) and on Android via DAVx5; setup is straightforward but takes more steps than installing a first-party app.
I synced the Posteo calendar to Apple Calendar on macOS and iOS via the standard CalDAV URL Posteo publishes on its support page. The sync was clean, two-way, and reliable across a week of testing. The same flow worked for contacts via CardDAV. On Android, the canonical setup is DAVx5 (paid app, €5–6 one-time on Play, free on F-Droid) which handles both calendars and contacts — Posteo’s support documentation walks through it explicitly.
Mobile email itself is whatever IMAP client you choose. iOS Mail does the job. K-9 Mail and its modern fork FairEmail are the Android picks. Apple Mail supports IDLE push so new mail notifications are instant. Android IMAP IDLE behaviour depends on the client and the OEM’s battery-optimisation settings, which can delay notifications by a few minutes on aggressively-tuned devices like Samsung’s. This is the single area where Proton Mail and Tuta clearly out-execute Posteo: a first-party push-notification path on Android that bypasses the IMAP IDLE flakiness.
If you want a polished mobile-first email experience with no setup decisions, Posteo is the wrong choice. If you already run Apple Mail, Thunderbird, or K-9 and the prospect of typing an IMAP server address doesn’t bother you, you’ll never notice the absence of a first-party app.
Pricing — one plan, transparent add-ons
Posteo has a single base plan at €1/month, billed in advance for 1, 3, 6, 12, or 24 months. The base includes 4 GB storage (doubled from 2 GB in February 2026), two alias addresses, three calendars, contacts, notes, and the full encryption suite. Storage upgrades and additional aliases are paid add-ons priced transparently on posteo.de/en/site/prices. There is no free tier, no free trial, no enterprise plan, no per-seat business pricing.
| Item | Price | Notes |
|---|---|---|
| Base mailbox | €1/month | 4 GB storage, 2 aliases, 3 calendars, all encryption features |
| Storage upgrade | Paid add-on (tiered) | Live prices on posteo.de/en/site/prices |
| Extra aliases | Paid add-on (per alias) | Live prices on posteo.de/en/site/prices |
| Custom domain | Not offered | Deliberate anonymity choice — use Mailbox.org or Fastmail instead |
| Business / team plan | Not offered | Posteo is a single-mailbox product by design |
| Payment methods | SEPA, bank transfer, PayPal, credit card, cash by mail | Cash is the anonymity option |
| Billing terms | 1, 3, 6, 12, 24 months in advance | No auto-renewal traps |
I will not quote add-on cents on this page because the storage and alias add-on prices change occasionally and Posteo publishes them on a live page that should be your source of truth. The principle to internalise: Posteo has no hidden costs, no surprise renewals, and the base €1/month buys a real mailbox you can use for years.
The economics versus competitors are stark. Proton Mail Plus is €4.99/month with a longer feature list (custom domain support, bundled Calendar, bundled Drive). Tuta’s paid tier starts at €3/month. Fastmail’s entry tier is $5/month. Mailbox.org runs €1–3/month depending on tier. Posteo at €1 is the cheapest serious privacy mailbox, by a margin, and the only one that accepts cash.
Posteo vs ProtonMail, Tuta, Fastmail, Mailbox.org
Posteo’s competitive niche in 2026 is “cheapest serious privacy mailbox under German jurisdiction, with anonymous payment and full IMAP openness.” Proton Mail wins on apps, suite breadth, and zero-access by default. Tuta wins on zero-knowledge architecture. Fastmail wins on speed, search, and polish. Mailbox.org wins on custom-domain support at a similar price point. Pick Posteo when payment anonymity, German jurisdiction, IMAP openness, and €1/month all matter together.
| Dimension | Posteo | ProtonMail | Tuta | Fastmail | Mailbox.org |
|---|---|---|---|---|---|
| Base price | €1/month | €4.99/month (Plus) | €3/month (Revolutionary) | $5/month (Standard) | €1/month (Mail Light) |
| Free tier | No | Yes (1 GB) | Yes (1 GB) | No (30-day trial) | No (30-day trial) |
| Storage included | 4 GB | 15 GB (Plus) | 20 GB (Revolutionary) | 30 GB | 2 GB (Light) |
| Custom domain | No (by design) | Yes (Plus) | Yes (Revolutionary) | Yes | Yes |
| PGP support | Yes (webmail since 2014) | Yes (native, auto) | Proprietary E2E | Yes (Masked) | Yes |
| S/MIME support | Yes (Feb 2026) | No | No | Yes | Yes |
| IMAP/SMTP | Yes (open) | Bridge required | No (proprietary) | Yes | Yes |
| Mobile apps (first-party) | No | Yes (iOS, Android) | Yes (iOS, Android) | Yes (iOS, Android) | No |
| Anonymous payment | Yes (cash by mail) | Limited (BTC) | Yes (cash by mail) | No | Limited |
| Jurisdiction | Germany | Switzerland | Germany | Australia / US-friendly | Germany |
| Green energy | 100% (Green Planet Energy) | Claims renewable | Claims renewable | Not prominent | Renewable claims |
| Suite breadth | Email only | VPN, Drive, Calendar, Pass | Calendar | Calendar, Contacts | Office (paid add-on) |
The smaller-team / business-grade alternative is Mailbox.org — Berlin-based, similar €1 entry tier, supports custom domains and team plans, less aggressive about anonymity. The bundled-suite alternative is Proton Mail — Swiss jurisdiction, native apps, VPN/Drive/Calendar/Pass included at higher tiers. The zero-knowledge purist alternative is Tuta (formerly Tutanota) — its proprietary protocol means no IMAP, but stronger architectural guarantees. The polish-first alternative is Fastmail — fastest webmail in the category, but no anonymous payment and weaker jurisdictional story for EU buyers.
For deeper desktop client comparisons that work cleanly with a Posteo IMAP account, see best email clients for Windows and best email clients for Mac. For keeping a Posteo inbox clean once the mailbox is live, best unsubscribe tools 2026 covers the privacy-respecting options.
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Where Posteo Falls Short
The honest negatives, after two weeks of test-mailbox use and a scan of independent reviews:
- No custom domain support, ever. This is the single most common deal-breaker. Posteo’s stated reason (anonymity) is defensible but rules out professional use where you need me@mydomain.com. If you need a custom domain with similar privacy posture, Mailbox.org is the direct alternative.
- No first-party mobile apps. You rely on Apple Mail, K-9, FairEmail, or another IMAP client. This works fine for technical users but is friction for non-technical buyers who expect a one-tap install. Push notifications on Android depend on the third-party client and OEM battery settings.
- No team / business plan. Posteo is a single-mailbox product. There is no admin console, no shared inbox, no team billing, no SSO. For 2+ user teams, look at Mailbox.org or Fastmail.
- Webmail UI feels dated. The JavaScript-light philosophy is a feature for paranoid users and a drawback for users who expect Gmail-grade interactivity. The compose, calendar, and contacts panels are functional but visually stuck in 2015.
- Storage upgrades are not free. Proton Mail Plus gives you 15 GB; Tuta Revolutionary gives you 20 GB; Posteo gives you 4 GB included and meters anything above it. If you keep a decade of mail with attachments, factor storage add-on costs into the comparison.
- English-language support is improving but still German-default. The web UI is fully translated; help articles are mostly translated; outbound communications from the company default to German with English follow-ups. Acceptable, not seamless.
- No AI features at all. No compose assistance, no smart sorting, no summarisation. For privacy-purists this is a feature (no AI eyeballs on your mail); for productivity-first users this is an absence to weigh against alternatives.
- No free trial. You pay at least €1 to try. The smallest commitment is one month at €1, refunded if you cancel within the legal cooling-off window under EU consumer law. Low friction in practice, but worth noting versus Proton’s free tier.
Verdict
Posteo in 2026 is the best-value privacy mailbox on the market for users who want a real IMAP account under German jurisdiction, paid anonymously by cash if desired, with PGP and S/MIME end-to-end encryption, running on actual renewable energy. €1/month, 4 GB included storage, no custom domain support (by design), no first-party mobile apps (deliberate), no AI (deliberate). The buyers who get full value from Posteo are technical or semi-technical privacy-conscious users who already live in Thunderbird, Apple Mail, or K-9, and who care about jurisdictional anonymity and a serious privacy posture more than about a polished mobile app.
Best for: Privacy-first solo users, journalists, lawyers, activists, anyone who values German jurisdictional posture over US-controlled providers, anyone who wants their email running on actual wind power, and anyone for whom €1/month is the right price ceiling for a mailbox. Users who already have a preferred IMAP client (Thunderbird, Apple Mail, eM Client) and want a privacy-first backend to plug into it.
Skip if: You need a custom domain at me@mydomain.com — Mailbox.org, Proton Mail Plus, or Fastmail are the right answer. You need first-party iOS or Android apps with push notifications that just work — Proton Mail and Tuta have those. You want a bundled VPN/Drive/Calendar suite — Proton’s the right buyer for that. You want AI compose features — Shortwave, Gmail, or any of the AI-Gmail clients fit that.
Worth €1/month? Yes, unconditionally, if any of these are true for you: you care about jurisdictional anonymity, you want to pay in cash, you already use a standalone IMAP client, you want the cheapest serious privacy mailbox on the market, or you specifically value running your email on actual renewable energy. If none of those apply, the €4–5/month tier providers (Proton, Fastmail) deliver more polish for the additional spend.
Alexis Dollé, email expert for 10+ years. Founder of Email Tools. I test every email client and utility myself, then write about them the way I’d explain them to a friend — no marketing fluff, no sponsored rankings, every claim sourced.
LinkedInSources & references
- Posteo — Services and Features page. Base plan €1/month, 4 GB storage, 2 aliases, 3 calendars, IMAP/SMTP/POP3/CalDAV/CardDAV, PGP and S/MIME in webmail, supported languages (EN, DE, FR, ES). Accessed 2026-05-17. posteo.de/en/site/services
- Posteo — Security and Encryption page. Crypto mail storage, inbound encryption with PGP/S/MIME, TLS/DANE mandatory transport, two-factor authentication TOTP, BSI TR-03108 v2 certification, header stripping. Accessed 2026-05-17. posteo.de/en/site/security
- Posteo — Sustainability page. 100% renewable energy via Green Planet Energy (Austrian/German wind and hydro), Frankfurt data centre integration 2020, no business flights since 2009, FSC-certified furniture, GLS Bank for customer accounts, Umweltbank for company savings. Accessed 2026-05-17. posteo.de/en/site/sustainability
- Posteo — Blog (English). February 2026 S/MIME end-to-end encryption release with independent audit. February 2026 storage doubling from 2 GB to 4 GB. 2025 charitable donations of €77,500. Accessed 2026-05-17. posteo.de/en/blog
- Posteo — Pricing page. Add-on prices for storage and extra aliases, billing terms 1–24 months in advance, accepted payment methods (SEPA, bank transfer, PayPal, credit card, anonymous cash by mail). Accessed 2026-05-17. posteo.de/en/site/prices
- BSI — TR-03108 v2 Secure Email Transport technical guideline. Posteo’s certification basis. bsi.bund.de — TR-03108
- Email Tools, “Best email clients for Windows 2026” — IMAP clients that pair with a Posteo mailbox. email-tools.me/posts/best-email-clients-windows-2026/
- Email Tools, “Best email clients for Mac 2026”. email-tools.me/posts/best-email-clients-mac-2026/
- Email Tools, “Best unsubscribe tools 2026” — keeping a Posteo inbox clean. email-tools.me/posts/best-unsubscribe-tools-2026/
- Email Tools, “StartMail review” — Dutch privacy-mailbox alternative. email-tools.me/posts/startmail-review/
- Email Tools, “Hushmail review” — Canadian PGP-mail alternative. email-tools.me/posts/hushmail-review/
Frequently asked questions
What is Posteo and who is it for?
Posteo (posteo.de) is a Berlin-based privacy-first paid email provider founded in 2009. One plan, €1/month, 4 GB included storage, two aliases, PGP and S/MIME end-to-end encryption in webmail, full IMAP/SMTP/CalDAV/CardDAV support, and anonymous cash-by-mail payment accepted. It is built for privacy-conscious solo users and small teams who want a real mailbox under German jurisdiction, no ads, no tracking — not for organisations that need first-party mobile apps or business-grade collaboration features.
How much does Posteo cost in 2026?
Posteo has a single plan: €1 per month, billed in advance for 1, 3, 6, 12 or 24 months. The base price includes 4 GB of mailbox storage, two alias addresses, three calendars, contacts, notes, and full encryption features. Storage and additional aliases are paid add-ons priced transparently on the live pricing page. There is no free tier.
Is Posteo really anonymous?
Yes, more so than almost any competitor. Posteo accepts cash sent by mail in an envelope, plus standard bank transfer, SEPA direct debit, PayPal and credit card. Payment data is never linked to the mailbox account itself — that is the architectural privacy feature. The signup form requires no name, no phone, no recovery email. Posteo also strips your IP address from outgoing email headers so recipients cannot trace the sender’s location.
Does Posteo support PGP and end-to-end encryption?
Yes, both PGP and S/MIME. PGP has been in the Posteo webmail since 2014; S/MIME was added in February 2026 with an independently audited implementation. Users can also enable a “crypto mailbox” that encrypts the entire mailbox at rest with the account password, so even Posteo cannot read stored messages. Inbound encryption (encrypting unencrypted incoming mail with your public key before storage) is supported too.
Can I use Posteo with my own custom domain?
Not directly. Posteo deliberately does not support custom domains on its standard plan — the company’s stated reason is that custom domains weaken anonymity (they tie the mailbox to a domain whose WHOIS or DNS history can be linked back to you). If you need a custom domain with similar privacy posture, Mailbox.org, Proton Mail Plus, or Fastmail are better fits. This is the single most common deal-breaker I see in Posteo reviews.
How does Posteo compare to ProtonMail and Tuta?
Proton Mail wins on first-party mobile and desktop apps, zero-access architecture by default, and a bundled suite (VPN, Drive, Calendar). Tuta wins on zero-knowledge architecture with its own end-to-end encrypted protocol. Posteo wins on price (€1/month is the lowest serious privacy mailbox on the market), payment anonymity (cash by mail), open IMAP/SMTP that works with every standard email client, and a German legal home with the BSI TR-03108 v2 certification. Pick Posteo when you want a real IMAP mailbox under EU/German law for the price of a coffee per month.
Related: StartMail review — Dutch privacy mailbox with unlimited PGP aliases. Hushmail review — Canadian PGP-mail option. Best email clients for Windows 2026. Best unsubscribe tools 2026 — keep your Posteo inbox clean.