Hi
I found the strange problem,
users said cannot send any email and I found user email address register
in spam-address.tab
but I surely no one add it by manual this problem occur two time but
difference email address.
it same case in spammers.tab, some time found IP Address register in
Are you sure that no anti-spam or some script is running in your server?
Xmail, by default, doesn´t add entries in theses files automatically.
Try to monitor these files with something like:
http://www.ihaveapc.com/2011/11/how-to-monitor-file-system-changes-in-linux-in-real-time/
to see which