So I receive some SPAM email every week that why there is NO Antispam system.
Today I had received a very strange e-email from an MAILER-DAEMON address who alert an email sent from my address (who I have not sent anything) has been blocked for a wrong not supported attachment.
The attachment seems to be a virus file as is .zip.exe
So now HOW I can do for verify if an email is really sended from my server without my knowledge or the email I have received is a fake?
Maybe i have to check Exim or Dovecot log? And i have to read all log or there is a way for search..
In the alert Mailer Daemon message there are my email address and the to address who have received this file.