Gmail: Mark an Email as Not Spam (and Keep It Out)

Gmail blocks more than 99.9% of spam, phishing, and malware — and at nearly 10 million spam emails stopped every minute, a few real messages inevitably get swept up with them. When that happens to a client reply or a receipt you needed, the fix is the Not spam button. I tested the full recovery flow on Gmail web and the mobile app: where the button hides, what it actually trains, how to rescue a folder full of wrongly-flagged mail at once, and how to build a filter so a trusted sender never lands in spam again.

Where the Not Spam Button Is

On the web, click More in the left menu to expand it, click Spam, tick the box next to the message, then click Not spam at the top. On the Gmail app, tap the menu, open Spam, open the message, and tap Not spam (or the three-dot menu, then Not spam).

The button only appears inside the Spam folder, which is why people miss it — Spam is hidden under More in the left sidebar by default, below Sent, Drafts, and your labels. The full web path, straight from Google’s Gmail Help:

1. Open Gmail and click More in the left menu to expand the folder list.
2. Click Spam.
3. Tick the checkbox next to the message you want to rescue.
4. Click Not spam at the top of the list.

On the Gmail app (Android, iPhone, iPad), the flow is one tap deeper: open the menu, tap Spam, open the message, and the Not spam action sits either as a button or behind the three-dot overflow menu at the top right. The message leaves Spam the instant you confirm.

What Marking Not Spam Actually Does

Not spam does three things at once: it moves the message into your inbox, it tells Gmail’s classifier this sender is wanted, and per Google, future emails from that sender won’t go to Spam. It does not auto-add the sender to your contacts — that is a separate, optional reinforcement.

Clicking Not spam is not just a one-time move. It is a training signal. Gmail’s filter is a machine-learning classifier, and every Not spam click is a labelled correction telling it “you got this sender wrong.” Google’s Help is explicit on the lasting effect: after you remove the email, “future emails from that sender won’t go to Spam.”

What it does not do automatically is add the sender to your address book. That matters, because Google lists adding a contact as its own distinct safeguard: “When you add the sender to Google Contacts, Gmail stops sending their messages to Spam.” So the strongest single-message recovery is two clicks — Not spam, then save the sender as a contact. If the problem is the reverse direction and you need to unblock a sender you previously blocked, that is a separate setting, because blocked senders keep getting flagged even after you rescue their mail.

Recover Wrongly-Flagged Mail in Bulk

In the Spam folder on the web, tick the checkbox beside each wrongly-flagged message — or the master checkbox to grab the whole page — then click Not spam once. Every selected message moves to the inbox together. Do it before the 30-day auto-purge, because deleted spam cannot be recovered.

If your spam folder collected weeks of misrouted mail, you do not have to rescue messages one by one. On Gmail web, the master checkbox at the top left selects every message on the current page; tick it, then click Not spam to move the lot in a single action. Untick anything that is genuinely junk first.

Timing matters here. Gmail empties the Spam folder automatically, deleting messages older than 30 days, and once a spam message is gone it is gone — there is no recovery. So a periodic check of the spam folder is worth the minute it takes; a real invoice or password reset can sit there silently until the purge removes it. If your folder is a swamp of genuine junk that makes the real mail hard to spot, clean the spam folder down to nothing first, then the wrongly-flagged messages are obvious.

Build a Filter So It Never Recurs

For a sender that keeps getting flagged, create a filter: open Show search options, enter the address in the From field, click Create filter, then tick Never send it to Spam. That is a deterministic rule that overrides the filter’s prediction for that sender every time.

Marking Not spam nudges the classifier; a filter commands it. When a specific sender lands in spam repeatedly, stop re-rescuing and set a permanent rule. The steps, per Google’s filter documentation:

1. In the search box at the top of Gmail, click Show search options.
2. Type the sender’s address in the From field.
3. Click Create filter at the bottom of the search window.
4. Tick Never send it to Spam.
5. Click Create filter to save it.

From then on, mail from that address skips the spam filter entirely. This is the difference between a soft preference and a hard rule — and it is the same mechanism worth checking when your Gmail filters aren’t working as expected. Pairing the filter with a Contacts entry for the same sender makes a future misroute almost impossible.

Why Legit Mail Lands in Spam

Google names three common causes: Gmail can’t confirm who actually sent the message, the sender’s address looks very similar to a known sender (a spoofing signal), or a Workspace admin set a policy that flags it. New newsletters and misconfigured sending domains trip the first; look-alike addresses trip the second.

Good mail gets flagged for reasons that have little to do with the message you actually wanted. Google’s own list of causes:

• Gmail can’t confirm who sent the email. When a sending domain’s authentication is missing or broken, Gmail cannot verify the sender, so it errs toward Spam. New newsletters and small-business senders trip this most.
• The address looks very similar to a known sender. Look-alike addresses are a classic phishing tactic, so Gmail treats near-matches with suspicion — and occasionally a legitimate sender on a similar domain pays the price.
• An admin set a policy. On a Workspace account, your administrator may have rules that route certain mail to Spam regardless of content.

None of these is about you doing something wrong; they are the filter being cautious. Marking Not spam corrects the immediate case, and a filter or contact entry corrects it for good. If the opposite keeps happening — junk reaching your inbox — the move is to report it as spam so the classifier learns in the other direction.

When Not Spam Won’t Stick

Not spam trains the filter but is not an absolute guarantee. If the sender’s domain has authentication problems, or you previously blocked them, mail can keep getting flagged. The durable fix is a Never send it to Spam filter plus a Contacts entry, which turns a soft signal into a hard rule.

A single Not spam click sometimes does not hold, and the reasons are predictable:

• You blocked the sender earlier. Google notes that once you block someone, Gmail keeps identifying their mail as spam even after you remove it from the folder. Unblocking is the fix, not Not spam.
• The sender’s domain is genuinely misconfigured. If their SPF, DKIM, or DMARC records are broken, Gmail’s caution is structural — your filter overrides it on your end, but the sender still needs to fix their setup.
• The signal is weak against the volume. One correction against a sender Gmail strongly distrusts may not outweigh its model immediately; the filter makes the rule absolute where a click only leans on the prediction.

If you have clicked Not spam and mail is still getting through to spam, escalate from the soft signal to the hard rule: filter plus contact. That combination is what reliably ends the misrouting.

Verdict

Use Not spam for the one-off recovery and to train the filter; use a Never send it to Spam filter plus a Contacts entry for any sender that keeps getting flagged. The button moves and teaches; the filter guarantees. Together they end the problem.

Best for: anyone who found a real message in spam and wants it back in the inbox now, plus a way to stop the same sender getting flagged again. Not spam handles the recovery and the training in one click; the filter makes it permanent.

Skip if: the message in spam is genuinely unwanted — then leave it, or report it as spam to teach the filter the other way. Not spam is only for mail you actually want.

Open Spam, select the wrongly-flagged mail, click Not spam, and for repeat offenders add a Never send it to Spam filter and a contact. Check the folder before the 30-day purge, and your real mail stops getting lost behind a 99.9% wall built to catch the other 10 million per minute.

Alexis Dollé

Founder & Editor

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.

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Related: Report spam in Gmail — train the filter the other way. Spam still getting through? — when Not spam isn’t enough. Check your spam folder — before the 30-day purge takes real mail.