Block an Email Sender in Outlook: Steps and Fixes

To block an email sender in Outlook, select a message from that sender, open the message’s options, and choose Block sender (or Block > Block sender). In classic Outlook for Windows, right-click the message and choose Junk > Block Sender. New messages from a blocked address are generally sent to Junk Email, not erased automatically.

What blocking a sender does

Blocking tells Outlook to treat future mail from a particular email address as unwanted. The message may still arrive in your mailbox system, but Outlook routes it to the Junk Email folder rather than the Inbox. Blocking is therefore useful for recurring unwanted messages that are not necessarily dangerous, such as newsletters you cannot unsubscribe from or repeated messages from an individual address.

Blocking does not usually delete messages that are already in the Inbox or another folder. It also does not tell the sender that you blocked them. A sender may continue to send mail, and you may still see those messages in Junk Email. Blocking one address also does not automatically block every address at the same company or every address using a similar display name.

Outlook’s exact controls vary among classic Outlook for Windows, the newer Outlook app, Outlook on the web, and Outlook for Mac. The wording and placement can change as Microsoft updates the apps, but the message’s context menu or options menu is usually the quickest place to look.

Block a sender in new Outlook or Outlook on the web

In new Outlook for Windows and Outlook on the web, use the message list or open the email, then look for the block option in the message actions. The steps are generally:

Find an email from the address you want to block. Check the actual sender address if the display name is unfamiliar or misleading.
Select the message. If it is open, use the message’s More options menu (often shown as three dots); if it is in the message list, right-click it or open its options menu.
Choose Block or Block sender. In some layouts, Block opens a second menu where you select Block sender.
Confirm the action if Outlook asks. The sender’s address should then appear in your blocked senders list.

You can also review the list directly. Select the gear icon for Settings, go to Mail > Junk email, and look under Blocked senders and domains. The same general settings path is used in Outlook on the web, although labels and layout can differ slightly by account or rollout. To remove a blocked entry, select it and use the remove or trash control, then save if the page presents a save button.

Block a sender in classic Outlook for Windows

In classic Outlook for Windows, blocking is available from a message’s Junk menu. Select or right-click a message, then choose Junk > Block Sender. You may be prompted to confirm. Outlook adds the address to its Blocked Senders List and treats later mail from it as junk.

If the command is not on the right-click menu, select the message and use the ribbon: Home > Junk > Block Sender. In some classic Outlook versions the Junk control is in the Delete group. To review or edit the list, go to Home > Junk > Junk E-mail Options > Blocked Senders. Select an address and choose Remove to unblock it.

These instructions apply to the classic Windows desktop app, not necessarily the newer Outlook app that can be installed on Windows. If your ribbon does not have the Junk controls described here, check whether you are using new Outlook; its menus and settings are different.

Block a sender in Outlook for Mac

In Outlook for Mac, select a message from the sender and look for Block Sender in the message’s context menu or in the Message menu. Depending on the Outlook for Mac version and layout, the control may be grouped with junk-mail actions. Confirm the block if prompted. If you do not see it, open the message’s three-dot menu or check Outlook’s settings for junk-mail controls; interface updates can move commands.

To reverse the action, open Outlook settings and find the junk-mail or blocked-senders list, then remove the address. The Mac interface is not identical to classic Outlook for Windows, so do not rely on the Windows ribbon path if you are using a Mac. A work or school account can also have organization-level filtering that an individual user cannot change.

Block an address or an entire domain?

Blocking a specific address is usually the safer choice. For example, if repeated unwanted mail comes from offers@example.com, blocking that address targets mail from that exact sender. It will not necessarily stop messages from news@example.com, even if both addresses belong to the same organization.

Some Outlook versions let you add a domain, such as example.com, to the blocked list. That can catch messages sent from multiple addresses at that domain, but it can also divert legitimate messages you want. A domain block may affect receipts, account alerts, or correspondence from other people at the same organization. Use it only when you are confident you do not need mail from that domain, and review the Junk Email folder for mistakes.

Choose an address block when one person or one sending address is the problem.
Consider a domain block only when unwanted mail consistently comes from many addresses at the same domain.
Use unsubscribe for a legitimate mailing list you signed up for, rather than blocking a company’s entire domain.

Blocking, junk reporting, phishing, and unsubscribe

These actions solve different problems. Block sender changes how Outlook handles future mail from an address. Report junk tells the service that a message is unwanted and may contribute to filtering decisions. Report phishing is intended for messages that try to steal passwords, payment details, or other sensitive information through deception. If an email is a scam or impersonation attempt, reporting it as phishing is more appropriate than only blocking the sender.

For a legitimate newsletter, use its unsubscribe link if you trust the sender and the message is expected. Reputable mailing lists generally provide an unsubscribe option. Do not click links or open attachments in a suspicious message just to unsubscribe; report or delete it instead. Blocking can be helpful when unsubscribe does not work, but it does not cancel a subscription or stop the sender from using a different address.

Outlook’s labels for reporting vary by app and account. In many versions, reporting actions appear in the message toolbar or its three-dot menu. If your workplace provides a dedicated Report button, follow your organization’s process, particularly for suspected phishing.

Why blocked email may still appear

If a message from a blocked sender still reaches the Inbox, first check whether the address in the message matches the one on the blocked list. A familiar display name is not proof that the underlying email address is the same. Some senders use multiple addresses, mailing services, or changing domains, so blocking one address cannot reliably catch every variation.

Also check whether the message was delivered to a different mailbox or account than the one where you created the block. Outlook settings can be account-specific, especially when you have personal and work accounts open together. Review the blocked list for the account that received the message, and confirm that the address was added correctly.

Work and school mail may also be subject to Microsoft 365 or organization-managed filtering. An administrator’s rules, quarantine settings, or security tools can affect where messages go and which controls are available. If a message is dangerous or repeatedly bypasses personal blocking, report it to your organization’s IT or security team instead of assuming that adding an address to your personal list will override those systems.

Unblock a sender and recover a message

To unblock someone in new Outlook or Outlook on the web, go to Settings > Mail > Junk email, find the address under Blocked senders and domains, and remove it. In classic Outlook for Windows, open Home > Junk > Junk E-mail Options > Blocked Senders, select the entry, and choose Remove. In Outlook for Mac, remove the address from the blocked-senders or junk-mail settings.

Unblocking affects future filtering; it does not necessarily move earlier messages back to the Inbox. If a wanted message is already in Junk Email, open that folder, select the message, and choose Not junk or Report not junk when available. You can then move it to the Inbox. Check the message carefully before marking it safe, especially if it contains unexpected links or attachments.

Frequently Asked Questions

Does Outlook notify someone when I block them?
No. Outlook does not send a notification saying that you blocked the sender. The sender can still send messages, but Outlook is set to treat mail from the blocked address as junk.

Does blocking an email sender delete old messages?
No, blocking generally affects future messages. Existing mail stays where it is unless you delete or move it yourself. Check Junk Email as well as the Inbox if you are looking for a message.

Can I block someone in Outlook without opening their email?
Usually, yes. Select or right-click the message in the message list and use its options menu to choose the block command. You do not need to open a link or attachment to block the sender.

Will blocking a sender stop all email from that company?
Not if you block only one address. Other addresses at the company may still reach you. Blocking a whole domain can catch more addresses, but it may also divert legitimate messages from that domain.

Why does Outlook still show mail from a blocked address?
Check whether the message came from the exact blocked address and whether it arrived in the same account where you set the block. The sender may have changed addresses, or organization-level filtering may affect the result. Review the Junk Email folder and blocked list before adding more rules.

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