Problem with email send out but not from us
I have a new server, when I move my domain name to this new server, I receive a few rejected email saying that I've send an email with virus and have been rejected.
When we look at the email header, it show that the email is being send from other email address but use our email address and the sending, basically that email didn't go through our email server........
We thought it is just another spammer who use our email address as their reply address.......
We move another client to the server and with 2 days, the client send us email saying that they got a lot of rejected email saying that they send a virus...... same thing, the email was send by other email server but using my client email address....
does my server been hack? how do I check this?
I'm running Redhat Linux Enterprise with Plesk and I have a hardware firewall to protect my server......
thanks
