On Thu, Nov 08, 2012 at 11:42:30PM +0800, Feel Zhou wrote: > My customer send mail via my mail server > And set def.cn at mynetworks
"Def.cn" is a domain, not an IP address. $mynetworks should be a list of networks, that is, IP addresses, not names. http://www.postfix.org/BASIC_CONFIGURATION_README.html http://www.postfix.org/postconf.5.html#mynetworks Also, if that is meant to be an example, please do not use real Internet names as examples. Example.TLD is set aside for that purpose in most gTLDs. $ whois def.cn Domain Name: def.cn ROID: 20040527s10001s02382825-cn Domain Status: clientTransferProhibited Registrant ID: 10071_1 Registrant: PANCHINA FOODS LIMITED ... > There is one mail can not send by my mail server > The log is just like > > Nov 8 23:11:45 shcx postfix/smtp[10637]: BC051AC0064: > to=<us...@abc.com>, relay=mail.abc.com[1.2.3.4]:25, delay=20816, > delays=20791/0.01/5.5/19, dsn=4.1.8, status=deferred (host > mail.abc.com[1.2.3.4] said: 450 4.1.8 < us...@def.cn>: Sender > address rejected: Domain not found ( in reply to RCPT TO command)) > > How can I fix it ? We don't know. It looks like mail.abc.com[1.2.3.4] is using reject_unknown_sender_domain in its restrictions, and apparently could not resolve def.cn. Generally it is a good idea to use a real sender address when sending mail. Most sites will use reject_unknown_sender_domain (or equivalent in other MTAs.) -- http://rob0.nodns4.us/ -- system administration and consulting Offlist GMX mail is seen only if "/dev/rob0" is in the Subject:
