It appears that my system has been hacked? the domina IP is now on 3 differnet blacklists and somehow there are over 8000 queued emails in Postfix that are bouncing.
ex: Mail ID: 007E112E5DA9
DATE: 2010/12/27 16:54
TO: email@example.com firstname.lastname@example.org email@example.com firstname.lastname@example.org email@example.com firstname.lastname@example.org email@example.com firstname.lastname@example.org email@example.com firstname.lastname@example.org email@example.com firstname.lastname@example.org email@example.com firstname.lastname@example.org email@example.com firstname.lastname@example.org email@example.com firstname.lastname@example.org email@example.com firstname.lastname@example.org SIZE: 2.70 kB
STATUS: delivery temporarily suspended: host e.mx.mail.yahoo.com[126.96.36.199] refused to talk to me: 421 4.7.0 [TS01] Messages from 188.8.131.52 temporarily deferred due to user complaints - 184.108.40.206; see http://postmaster.yahoo.com/421-ts01.html
how did this happen? How can it be resolved? how can this be avoided? I have never had this problem in 2 years on another Virtualmin instance with 50 domains!