Send Message when reject_unknown_hostname is invoked [resolved]
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From: jason hirsh on 13 Aug 2010 14:31 On Aug 13, 2010, at 2:22 PM, Wietse Venema wrote: > jason hirsh: >> I am apparently having an issue with some servers whose mail is being >> rejected because of >> >> reject_unknown_hostname >> >> the reject was shown here >> >> Aug 11 00:21:36 xxxxxxx postfix/smtpd[96422]: NOQUEUE: reject: RCPT >> from mail01a.yesbank.com[65.196.66.182]: 450 4.7.1 >> <MTL01PPSMTP1.YESBANK.COM>: Helo command rejected: Host not found; >> from=<pbonamas(a)yesbank.com> to=<diane(a)witheld.com> proto=ESMTP > ... >> but no reject message went out... Is there a way I can esnure an >> error message goes out to the sender??? > > No reject message is sent out because your server answers with SMTP > reply code 450. This corresponds with a "Try Again" class error. > The SENDING MTA will give up after trying for several days. Only then > will the sending MTA inform sender that the message is undeliverable, > > The 450 reply code means that the hostname lookup failed because > Postfix received no reply when it looked up the client hostname, > or when it tried to verify that the name really resolves to the > client IP address. > Ahh so where my server will try for 5 days before giving up ... the sender's will try for a period too THEN notify him.. Thanks.. now that I can sell..... if I can't get the clients to agree I would have to drop this restriction this combined with Larry Stones comment on the Back Scatter Issues is of a tremendous help thanks to all > Wietse
From: Michael Orlitzky on 13 Aug 2010 15:09
On 08/13/2010 02:31 PM, jason hirsh wrote: > > On Aug 13, 2010, at 2:22 PM, Wietse Venema wrote: > >> jason hirsh: >>> I am apparently having an issue with some servers whose mail is being >>> rejected because of >>> >>> reject_unknown_hostname >>> >>> the reject was shown here >>> >>> Aug 11 00:21:36 xxxxxxx postfix/smtpd[96422]: NOQUEUE: reject: RCPT >>> from mail01a.yesbank.com[65.196.66.182]: 450 4.7.1 >>> <MTL01PPSMTP1.YESBANK.COM>: Helo command rejected: Host not found; >>> from=<pbonamas(a)yesbank.com> to=<diane(a)witheld.com> proto=ESMTP >> ... >>> but no reject message went out... Is there a way I can esnure an >>> error message goes out to the sender??? >> >> No reject message is sent out because your server answers with SMTP >> reply code 450. This corresponds with a "Try Again" class error. >> The SENDING MTA will give up after trying for several days. Only then >> will the sending MTA inform sender that the message is undeliverable, >> >> The 450 reply code means that the hostname lookup failed because >> Postfix received no reply when it looked up the client hostname, >> or when it tried to verify that the name really resolves to the >> client IP address. >> > > Ahh so where my server will try for 5 days before giving up ... the > sender's will try for a period too THEN notify him.. Only in response to temporary (4xx) codes. In and after Postfix 2.6, the response is configurable (unknown_helo_hostname_tempfail_action). |