Whitelist earlier in SMTP conversation? #10

Synchro opened this Issue Nov 3, 2011 · 1 comment


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Synchro commented Nov 3, 2011

I've got some incoming emails bouncing because they don't have reverse DNS set, so they get rejected like this:

Nov  2 23:18:30 mail postfix/smtpd[24054]: NOQUEUE: reject: RCPT from unknown[x.x.x.x]: 450 4.7.1 Client host rejected: cannot find your hostname, [x.x.x.x]; from=<noreply@example.com> to=<me@example.net> proto=ESMTP helo=<mail1.example.com>

I want to receive these, but If I put the IP or name of this server in my whitelist, they still get rejected. Can that be fixed by checking the whitelist earlier? Some other way?

allard commented Nov 3, 2011

Hi Marcus,

Please have a look in /etc/postfix/main.cf. The reject most likely comes from reject_unknown_client_hostname in smtpd_client_restrictions. You can remove it or add additional whitelists before that if you want. Please post your findings on the mailing list. But it's not a fault as this is how Mailserv was intended to work.



@allard allard closed this Nov 3, 2011
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