Outlook Block Sender: How to Block Unwanted Emails

To block a sender in Outlook, select a message from that person, open the message’s options, and choose Block or Block sender. In classic Outlook for Windows, select the message and choose Home > Junk > Block Sender. Future messages from that address are normally routed to Junk Email, not permanently deleted.

What blocking a sender does

Blocking tells Outlook to treat mail from a particular email address as unwanted. It is a mailbox-level filtering action: Outlook does not usually send a rejection notice to the sender, and the sender may not know that you blocked them. Their later messages are directed to Junk Email, where you can still review, move, or delete them.

Blocking is useful for a person or mailing list that keeps emailing after you no longer want its messages. It is not the same as unsubscribing, reporting phishing, or creating a rule. Those actions solve different problems, so choosing the right one can keep useful mail from being filtered accidentally.

Block a sender when you want Outlook to filter future messages from a specific address.
Unsubscribe when you recognize a legitimate newsletter and want to stop receiving it at the source.
Report phishing or junk when a message is deceptive, suspicious, or unwanted and you want to flag it as such.
Create a rule when you want to organize messages using conditions such as subject words, recipients, or sender address.

Block a sender in Outlook for Windows

Microsoft 365 for Windows has two Outlook experiences: the newer Outlook and classic Outlook. Their menus differ, but the basic result is similar. If a button is not where these steps describe it, check whether you are using the other version; the newer app is often labeled simply Outlook, while the older desktop program may be labeled Outlook (classic).

New Outlook for Windows

Open the message from the sender you want to block. You can also select it in the message list.
Choose the message’s More options menu, usually shown as three dots.
Choose Block or Block sender, then confirm if Outlook asks.

Depending on the current layout, the command may appear in the message toolbar or in the three-dot menu. If you do not see it, open the message itself and check the full message menu. The blocked address should then appear in the account’s blocked-senders list, which you can manage in Settings.

Classic Outlook for Windows

Select a message from the sender. Opening the message is not always necessary.
On the ribbon, choose Home > Junk > Block Sender.
Confirm the prompt if one appears.

You can also right-click a message and look for the junk or block option in the context menu. In some classic Outlook layouts, the command is labeled Junk rather than Block. The exact menu can vary with ribbon customization, but the Block Sender command is part of Outlook’s junk-email controls.

Block a sender in Outlook on the web

Outlook on the web and Outlook.com use a browser interface. Open the message or select it in the message list, then open More actions (the three-dot menu). Choose Block or Block sender and confirm if prompted. Menu wording can change as Microsoft updates the interface, but the action is generally available from the selected message’s options.

If the message is clearly a scam or impersonation attempt, use the report option instead of treating it as ordinary unwanted mail. In Outlook on the web, the message toolbar or its menu may offer Report, with choices such as junk or phishing. Reporting flags the message for the service’s filtering systems; blocking is primarily your instruction about future messages from that address. You can block and report separately when both actions are appropriate.

Outlook for Mac and mobile apps

In current Outlook for Mac, open or select the message and check its three-dot message menu for a block option. To manage addresses directly, open Settings > Mail > Junk email and look for the blocked senders and domains controls. The layout and labels can differ between newer and older Mac releases, so Outlook on the web is a practical alternative if the option is missing.

In Outlook for iOS or Android, open the message and tap its three-dot menu. Depending on the app version and account type, you may see a block-sender action or a reporting option. Mobile menus change more often than desktop menus, and not every account exposes the same controls. If you cannot find a direct block command, use Outlook on the web or desktop to add the address to the blocked list.

Manage or unblock blocked senders

A mistaken block can usually be reversed. In new Outlook for Windows or Outlook on the web, open Settings > Mail > Junk email, then find the blocked senders and domains section. Select the address and use the remove or delete control. In classic Outlook for Windows, choose Home > Junk > Junk E-mail Options, open the Blocked Senders tab, select the address, and remove it.

After removing an address, new messages from it should no longer be filtered because of that blocked-sender entry. A message already in Junk Email may remain there; check the folder and move it to Inbox if you want to restore it. If mail continues going to Junk after you remove the block, another filter may be responsible, such as a rule, a junk-email setting, or an organization’s mail policy.

When reviewing a blocked list, check for typos and duplicate entries. If you block an address that shares a domain with an important contact, remember that an address-only block and a domain block have very different reach. Removing a domain entry may restore mail from many senders, not just one person.

Block an address or an entire domain?

Blocking a sender normally targets the exact address shown in the message, such as offers@example.com. It may not stop the same company or person from writing from a different address, such as news@example.com. If the service offers a blocked-domains field, adding example.com can affect messages from every address at that domain.

Use domain blocking cautiously. A domain may serve legitimate receipts, support messages, account alerts, and newsletters. Blocking a large email provider’s domain could filter unrelated messages from many people. For a single unwanted newsletter, unsubscribe or block its exact sending address before considering a broader domain entry.

There is also a limitation with forged or changing sender addresses. Unwanted mail can display an address that is misleading, or the sender can switch to new addresses. Blocking one address is not a complete defense against a persistent spam campaign. Report suspicious messages, avoid clicking their links, and use the service’s junk controls rather than replying to an untrusted sender.

What happens to blocked messages?

Blocking does not ordinarily erase the sender’s old messages or prevent you from opening them. It changes how Outlook handles later messages that match the blocked entry. Those messages are generally placed in Junk Email, where they may be automatically removed later according to the account’s retention behavior and settings. If you need to keep evidence of a threatening or fraudulent email, save it appropriately before deleting anything.

Junk Email is worth checking occasionally, especially after blocking a new address. Filtering is not infallible: an important message can land there, and unwanted mail can sometimes reach the Inbox. If a legitimate message is in Junk, mark it as not junk or move it to Inbox. For a trusted sender whose messages keep being filtered, check the safe-senders settings as well as the blocked list.

Work and school accounts may be governed by Microsoft Exchange or an organization’s security policies. An administrator can apply filtering or quarantine rules that are separate from your personal blocked list. If a message is quarantined or the block controls are unavailable, contact your organization’s IT support rather than assuming the sender block did not work.

Common problems and how to fix them

The Block option is missing: Open the message’s full three-dot menu, try the web version, or check whether you are in new Outlook or classic Outlook. Some mobile menus and managed accounts expose fewer options.
The sender still appears in Inbox: Confirm that you blocked the actual sending address, not just the display name. Check the blocked list and verify the message arrived after the block was added.
Mail from the sender appears under another address: Blocking one address does not necessarily block aliases or newly created addresses. Consider an exact domain block only if you are confident it will not catch wanted mail.
Good mail is going to Junk: Remove the accidental block, check rules and junk settings, and mark a wrongly filtered message as not junk. A trusted-senders list may help, depending on the account.
The sender is a work or school contact: Your organization may control filtering. Check with IT if you cannot change the list or if messages are being quarantined.

When to block, unsubscribe, or report

For a legitimate company newsletter, use the unsubscribe link if you trust the message and the link looks consistent with the company’s website. A valid unsubscribe request removes you from the sender’s list, whereas blocking only changes how Outlook handles messages that reach your mailbox. If you do not trust the message, do not click its links; report it as junk or phishing instead.

For repeated unwanted but non-fraudulent mail from a particular address, blocking is direct and simple. For a recurring category of mail, a rule may be more useful—for example, moving messages with a specific subject phrase to a folder. Rules can be broader or more selective than blocking, but they require care: a subject-based rule can catch legitimate messages that happen to use the same words.

For suspected phishing, use the report-phishing option when available. A block is not a substitute for reporting a dangerous message, and neither action should be treated as proof that future mail is harmless. Do not open unexpected attachments, share passwords, or provide payment details through links in suspicious email.

Frequently Asked Questions

Does Outlook notify someone when I block them?

Usually, no. Blocking generally changes how Outlook handles their future messages; it does not send the person a notification or a standard rejection message. They may still be able to send email, but it is routed according to your junk-mail settings.

Does blocking a sender delete their old emails?

No. Blocking is intended to filter future messages, not erase existing mail. Search your Inbox and other folders, including Junk Email, if you want to find or delete messages already received.

Can I block someone using the Outlook mobile app?

Sometimes. Open the message and check the three-dot menu for a block or report option. Because mobile options vary by app release and account, use Outlook on the web to manage the blocked list if the direct control is not shown.

Is blocking the same as unsubscribing?

No. Unsubscribing asks a legitimate mailing list to stop sending messages. Blocking tells Outlook to filter messages from an address. For a trusted newsletter, unsubscribe; for suspicious mail, avoid its links and report it.

Why do blocked senders still get through?

The message may come from a different address, the entry may have been removed or mistyped, or another account or organization policy may affect delivery. Check the actual sender address and the blocked list; persistent spam may require reporting rather than blocking only one address.

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