Hi, There!
I use zimbra 6.07 and from two weeks to now Im having too much of this message:
The funny thing is gmail.com, hotmail.com, other public services and private servers are delivering ok to my server.
Can somebody help me?

This is the mail system at host pop.solucoesideais.com.br.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<ronaldo@xangai.com.br>: conversation with mail.mycompnay.com[x.x.x.x]
timed out while sending message body