Originally Posted by till
This does not generally mean that your server got hacked, as everyone may use your domain as sender address which does not nescessary mean that the emails had been send from your server. Please post an excerpt of your mail log and the content of the file /etc/postfix/main.cf
Yes, but to go from zero to roughly 75 bounced emails in an hour it is an indication that SOMETHING changed and I have become a target. Successful or otherwise.
What's the location of my mail log and I'll post?