Thank you, Wietse I set it in the master.cf file. The mail is put into the defer queue. And I also set the line “relay”, It still in the defer queue, Why it not send the mail to the other mail server?
/etc/postfix/master.cf: smtp unix - - n - - smtp -o soft_bounce=yes -o smtp_fallback_relay=relayusa.example.com relay unix - - n - - smtp -o soft_bounce=yes -o smtp_fallback_relay=relayusa.example.com 2012/6/11 Wietse Venema <wie...@porcupine.org> > Feel Zhou: > > Maybe I do not make it clear. My mail server is in China, But Hotmail > > server or Gmail server,etc (for example )in Usa maybe reject ip (or ip > > segment )from china. so ,if my mail server in China be bounced by them, I > > want to use my other email server in USA to send the mail who is be > > bounced. What can I setting the mail server in China. Thanks a lot. > > /etc/postfix/master.cf: > smtp unix - - n - - smtp > -o soft_bounce=yes > -o smtp_fallback_relay=backuphost.example.com > > With this, mail that is rejected by backuphost.example.com will > stay in the queue until it is too old. > > Wietse >