How to Block Unwanted Emails on Windows 11

If you went looking for the Mail app to block unwanted emails on Windows 11 and could not find it, you are not doing anything wrong. Microsoft retired Windows Mail, Calendar and People, and Windows 11 now ships the new Outlook as the built-in email app.

The good news: blocking is still one right-click away. The catch worth knowing before you start is that where the block actually happens depends on which email account you added, not on your PC.

The short answer#

To block a sender on Windows 11, open the new Outlook, open a message from that sender, click the three-dot menu on the message, and choose Block. The sender's future mail then goes to Junk automatically.

This works cleanly for an Outlook.com, Hotmail, Live or Microsoft 365 account. If you added a Gmail, Yahoo, iCloud or other IMAP account to Outlook, the Block option cannot enforce a block for you — you have to block that sender on the provider's own website. The next sections cover both paths.

Before you start: which app, which account?#

Two things decide how you block. First, the app: as of July 2026 Windows 11 uses the new Outlook, and the classic Windows Mail app no longer sends or receives.

Second, and more important, the account type. Open Outlook, go to Settings, and look at Accounts to see whether the address you want to filter is an Outlook.com or Microsoft 365 account, or a Gmail, Yahoo, iCloud or IMAP account added from elsewhere.

• Microsoft account (outlook.com, hotmail.com, live.com, or Microsoft 365): Outlook's Block works and is enforced on Microsoft's servers.
• Third-party account (Gmail, Yahoo, iCloud, or any IMAP mailbox): Outlook can file mail with rules, but the real block must be set at the provider.
• Not sure which you have: the domain after the @ is the strongest hint, but always confirm in Settings > Accounts.

Steps: block a sender in the new Outlook#

1. 1

   Open the message

   In the new Outlook on Windows 11, click a message from the sender you want to stop. You do not need to open it full-screen.

2. 2

   Open the message menu

   Click the three-dot More actions menu on the message, or right-click the message in the list.

3. 3

   Choose Block

   Select Block, then Block sender. Outlook confirms and moves existing mail from that sender to Junk Email.

4. 4

   Confirm for a Microsoft account

   For an Outlook.com or Microsoft 365 account, that is all. Future mail from that address lands in Junk across every device signed into the account.

5. 5

   For Gmail, Yahoo or IMAP, block at the provider

   If Outlook shows the sender under a third-party account, open that provider's website (for example gmail.com or mail.yahoo.com), find the message, and use its own Block sender option. That is the block that actually sticks.

Where blocking happens by account type#

Why the same block reaches every device#

This is the part that trips people up, so it is worth stating plainly. A block is a rule that lives on the mail service, not a setting on your Windows 11 laptop.

So when you block a sender on the correct service — Microsoft for an Outlook.com account, Google for a Gmail account — the filter runs before the mail ever reaches any of your devices. Your phone, your web browser and your laptop all inherit it. Blocking on the PC is just one place to set a rule that applies everywhere.

What to do when blocking doesn't work#

If a blocked sender keeps arriving, one of a few things is usually true. Work down this list.

• You blocked in Outlook for a third-party account: Outlook cannot enforce it for Gmail, Yahoo or IMAP. Re-block on the provider's website.
• The sender rotates addresses: bulk senders send from a new address each time, so a single-address block never catches the next one. Use the Unsubscribe link, or block the whole domain in your provider's rules.
• It is landing in Junk, not gone: blocking moves mail to Junk rather than deleting it. That is working as designed; empty Junk when you like.
• The message is a phishing attempt: report it as phishing rather than only blocking, so the service learns the pattern.

A faster way: let an agent do it continuously#

The steps above work, and they keep working. But blocking is a per-sender chore, and the senders you most want gone — cold outreach and bulk mail — are exactly the ones that rotate addresses inside a domain so a single-address block never catches the next one.

That is the gap we built AI Emaily to close. Its cold-email filter and spam protection match on sender behavior and domain rather than one address, so a rotation does not reset the block, and it works across Gmail, Outlook and IMAP accounts in one place — the same accounts new Outlook cannot block for you. It runs continuously in the background instead of asking you to act on each message, and every action it takes is logged and reversible. We build AI Emaily. On Windows 11 it runs as a downloadable installer — an app window and taskbar presence built as an Electron shell around our web interface, not a native binary, so it will not match a native client on memory or deep OS integration but does get every feature the same day as the web app. It does not replace the manual block above; it is what that same block looks like when it never stops running.