How to Block a Domain in Outlook Mail on the Web

Hand
You can have Outlook Mail on the Web show that metaphorical hand to entire domains. StockUnlimited

Outlook Mail on the Web makes it easy to block messages by individual senders from showing up in your inbox folder. For even more blocking, you can put a ban on whole domains, too.

Block a Domain in Outlook Mail on the Web

To have Outlook Mail on the Web reject messages from all email addresses at a specific domain:

  1. Click the settings gear icon (⚙️) in Outlook Mail on the Web.
  2. Select Options from the menu that has appeared.
  1. Go to the Mail | Junk email | Blocked senders category.
  2. Type the domain name you want to block over Enter a sender or domain here.
    • ​​Type the part that follows "@" in a typical email address from the domain; for "sender@example.com", for instance, type "example.com".
  3. ​Click +.
    • ​​If you get the error message
      Error: You can't add this item to this list because it will impact a large number of messages or important notifications.​
      , see below.
  4. Now click Save.

Block a Domain in Outlook Mail on the Web Using Filters

To set up a rule that automatically deletes certain emails—all emails from a domain you cannot block using the blocked senders list, for example—in Outlook Mail on the Web:

  1. Click the settings gear icon in Outlook Mail on the Web.
  2. Select Options from the menu.
  3. Open the Mail | Automatic processing | Inbox and sweep rules category under Options.
  4. Click + (Add) under Inbox rules.
  5. Now click Select one… under When the message arrives, and it matches all of these conditions.
  1. Choose It includes these words | in the sender's address… from the menu that has appeared.
  2. Type the domain name you want to block under Specify words or phrases.
    • ​​Note that blocking a domain will also block all addresses at sub-domains.
  3. ​Click +.
  4. Now click OK.
  5. Click Select one… under Do all of the following.
  1. Select Move, copy or delete | Delete the message from the menu that has appeared.
  2. Typically, make sure Stop processing more rules is checked.
  3. Optionally, you can specify conditions that will prevent an email from being deleted even though it is from a blocked domain (or sender) under Except if it matches any of these conditions.
    • ​​You can allow certain sub-domains here, for example.
  4. ​Optionally, enter a name for your blocking rule under Name.
    • ​​The default Outlook Mail on the Web will use if you do not pick a name is the nebulous "Delete messages with specific words".
    • "Block example.com" should serve the purpose succinctly, for instance.
  5. ​Click OK.
  6. Now click Save.

Block a Domain in Windows Live Hotmail

To block all mail coming from a domain in Windows Live Hotmail:

  1. Select Options | More Options... (or just Options if no menu comes up) from the Windows Live Hotmail toolbar.
  2. Follow the Safe and blocked senders link under Junk e-mail.
  3. Now click Blocked senders.
  4. Type the undesired domain name — the domain being what comes after the '@' sign in an email address — under Blocked e-mail address or domain:.
  5. Click Add to list >>.

If you enter "examplehere.com", for example, all mail from fred@examplehere.com, joe@examplehere.com, jane@examplehere.com and so on will be blocked from your Windows Live Hotmail inbox.

(Updated October 2016, tested with Outlook Mail on the Web in a desktop browser)