Right-click a message from the sender you want to block, and then select Block > Block Sender. The blocked person can still send you mail, but if anything from his or her email address makes it to your …

If you're receiving unwanted email, you can block the email addresses and domains you don't want to receive messages from in new Outlook. Add any email address or domain to your blocked senders …

Use the Block or Allow settings to help control unwanted and unsolicited email messages by creating and managing lists of email addresses and domains that you trust and those that you don’t.

You can add names, email addresses and domains to these lists so the filter doesn't check messages from sources you trust, or blocks messages that arrive from specific email addresses and domains …

Learn how to block someone or add email addresses to the safe senders list in Outlook on the web.

Learn how to restrict certain email addresses from being able to sign in to your account.

Stop receiving email from someone by adding his or her email address to your blocked senders list. You can also unblock an email address from your blocked senders list.

Messages received from any email address or domain in your Blocked Senders List are sent directly to your Junk Email folder. To modify a sender in the list, select the sender, and then click Edit.

Microsoft Outlook is configured by default to block automatic picture downloads from the Internet. You can, however, unblock pictures that you think are safe to download.

If you've created a signature in Outlook on the web but didn't choose to automatically add it to all outgoing messages, you can add it later when you write an email message.