Over the past few day on my server, someone has been trying to send a lot of spam from it. So I put together SMTP Authentication. Now, the problem came where now email being sent form yahoo and hotmail wont go through. Any suggestions on getting around this?
Well, I was not the one who dealt with it, I have a friend who is doing the server management. Though, I will try to give you a general idea.
First SMTP authentication was put in place. So that stopped the spam from being sent from the server. The problem that came in place after that was that certain email was being blocked from email providers like yahoo and hotmail. So for that, a filter was put in place to make sure it went through. That filter also blocks any email that is not sent to a valid email on the server. Also, any attempted spoofing is logged with full details.