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=<pbona...@yesbank.com> to=<di...@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
