On Wed, 2011-11-16 at 03:58:32 +0100, Reindl Harald wrote: > is there any good reason why this is rejected with 450 instead 5xx to > tell the sending server "do not try again with your config"?
Yes, and that reason is documented in postconf(5). > Nov 16 03:53:37 mail postfix/smtpd[15778]: NOQUEUE: reject: RCPT from > unknown[193.83.162.5]: 450 4.7.1 Client host rejected: cannot find > your reverse hostname, [193.83.162.5] http://www.postfix.org/postconf.5.html#reject_unknown_reverse_client_hostname http://www.postfix.org/postconf.5.html#unknown_client_reject_code -- Sahil Tandon
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