I've got a huge problem, Lot of my emails are in deferred queue with different message errors like this.
conversation with name.domain.com [x.y.y.z] timed out while sending message body
conversation with name2.domain2.com [z.m.b.g] timed out while sending end of data - message maybe sent more than once
host name3.domain3.com [e.t.h.f] said:421 transmission channel timeout. (in reply to end of data command)
host name4.domain4.com [d.t.q.r] refuse to talk to me: 450 4.7.1 client host rejected: cannot find your hostname [x.m.m.m]--> this is my public IP
delivery temporaly suspended: conversation with name5.domain5.com [l.p.i.u] timed out while sending message body
lost connection with mail.domainx.com [x.x.x.x] while sending end of data -- message maybe sent more than once
I don't know what could be happened, however there are many domains I can send message without problem
I'm using zimbra 6.0.8.