Incorrect Blocked Senders

[Sherry]

All of a sudden users at one particular company are receiving rejected
messages when they send me an email. They receive a message from
Worldnet.att.net. I have checked my blocked senders and they do not appear
there. Any suggestions?

 

[BillR]

It wouldn't have to do with Outlook. The rejection is at a server level and
you should check with the admin of that server to see why the blocking is
happening.