ok, I understand you, but I think my problems is diferent:
I have two servers
mx10 mail.test.com
mx20 mail2.test.com
When any send me e-mail, the first server will be recibed it (mail.test.com).
When the first server stoped, then the email will be recibed in second server (mail2.test.com).
When the first server wakeup, the mail conteined in second server howto go to the first server?
Sorry again for my english, and thak you.