Jun 1, 2017 - When an email you've sent bounces with Error 550 Message Rejected (or blocked), a spam filter has blocked the message. That's because. Learn how to unblock emails Occasionally, a legitimate email may be moved to your spam folder. To move the email back to your inbox and remove it from the SPAMfighter server, simply select the message and click the Unblock button in the SPAMfighter toolbar.

People change their minds. Maybe you put someone on your list of blocked senders in Windows Mail by mistake. Maybe their attitude has changed; maybe your attitude has changed. Whatever the reason, you now want to unblock this person. Follow these easy directions to remove a sender from the Blocked Senders list in Windows Mail.

Remove an Address From Blocked Senders in Windows Mail

To allow a sender's messages back into your Windows Mail Inbox:

1. Launch Windows Mail.
2. Select Tools > Junk E-mail Options... from the menu.
3. Go to the Blocked Senders tab.
4. Highlight the address or domain you want to delete from the Blocked Senders list.
5. Click Remove.

How to Back Up All Blocked Senders for Windows Mail

You can back up the entries on your Blocked Senders list. You should do this if you decide to delete all blocked senders:

1. Type regedit in the Start menu's Start Search field.
2. Click regedit under Programs.
3. Go down the registry tree to HKEY_CURRENT_USER­Software­Microsoft­Windows Mail.
4. Expand the Junk Mail key.
5. Select the Block Senders List key.
6. Select File > Export... from the menu.
7. Pick a location for the backup and name it Blocked Senders.
8. Click Save.

How to Delete All Blocked Senders From the Blocked Senders List

1. Type regedit in the Start menu's Start Search field.
2. Click regedit under Programs.
3. Go down the registry tree to HKEY_CURRENT_USER­Software­Microsoft­Windows Mail.
4. Expand the Junk Mail key.
5. Click on the Block Senders List key with the right mouse button.
6. Select Delete.
7. Click Yes to remove all entries from the Blocked Senders List.

Your Outlook.com account might be temporarily blocked because we noticed some unusual sign-in activity. We know that having your account blocked is frustrating, but we also want to protect you from fraud or abuse. Here's how to unblock your account.

Unblock your account

1. Go to https://account.live.com/ResetPassword.aspx to recover your account and reset your password.
2. Enter the email address of your blocked account and enter the characters you see on your screen and select Next.
   
3. Enter the code generated by your authenticator app or select Use a different verification option to get a text message.
   Notes:

   • You don't need a smartphone to receive a security code.
   • Text messages may come from either 'MSFT', a short number, or a mobile number. If you have requested a security code, you can trust the message that arrives.
     
   • If you don't have an alternate phone number or email address or you can't get to it, select I didn’t get a code when you’re prompted for a code at sign-in or I don’t have access to these when you’re resetting your password and then follow the instructions.
4. After you enter the security code, you'll need to change your password to complete the unblocking process.

Make sure you create a strong, unique password to help keep your account secure. Use capital letters, numbers, and symbols in your password, and try not to use the same password for different accounts. For more tips about how to make your password secure, see Help protect your Outlook.com email account.

If you can't unblock your account

If you still can't unblock your account by entering the security code or changing your password, go to When you can't sign in to your Microsoft account.