Hi Everyone,

I've a terrible problem with my production zimbra, this morning i've found in log this output like this

Jun 30 06:45:13 mail postfix/error[21778]: B81DA632FF1: to=<cutefallangel@yahoo.com.tw>, relay=none, delay=18140, delays=18140/0.21/0/0.47, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx-tw.mail.gm0.yahoodns.net[203.188.197.111] refused to talk to me: 421 4.7.0 [TS01] Messages from X.Y.Z.T temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)


Now the mail server has become (itself) Open Relay and now I've 20K email in queue..

This is in production for about 15 months without problem.

How could I solve ?

Help Me

Thank you very much