On Mon, Jan 19, 2015 at 12:12:34PM -0800, Michael Fox wrote:
> 450 4.1.2 <u...@nohow.noway.org>: Recipient address rejected: Domain not found
Turn off the default safety net, I have:
unknown_address_reject_code = 550
unknown_client_reject_code = 550
unknown_hostname_reject_code = 550
unverified_recipient_reject_code = 550
unverified_sender_reject_code = 550
I've left plaintext_reject_code at its default value. See:
http://www.postfix.org/postconf.5.html#unknown_address_reject_code
http://www.postfix.org/postconf.5.html#unknown_client_reject_code
http://www.postfix.org/postconf.5.html#unknown_hostname_reject_code
http://www.postfix.org/postconf.5.html#unverified_recipient_reject_code
http://www.postfix.org/postconf.5.html#unverified_sender_reject_code
> What seems reasonable to me is the following:
>
> -- If postfix receives a response from DNS that the domain does not exist,
> then reject with 550
That's the behaviour without the safety net.
> -- Otherwise, delay with 450 (DNS failure, etc.)
>
> http://www.postfix.org/ADDRESS_VERIFICATION_README.html#recipient says one
> can use unverified_recipient_reject_code to change the 450 (temporary)
> failure to a 550 (permanent) failure "when you trust Postfix's judgments".
The reject_code's should be changed in production systems once the
configuration is otherwise correct.
> As a newbie, I'm cautious about changing values from their default because
> I'm sure the default was chosen for a reason.
In this case an initial deployment safety net, that should be removed once
the configuration is believed correct.
> 1) Can someone explain what "when you trust Postfix's judgments" means,
> specifically?
Your DNS is not broken. Your main.cf settings are not broken.
> 2) What do you gurus do/recommend with "unverified_recipient_reject_code"?
See above.
> 3) If you do recommend changing "unverified_recipient_reject_code" to 550,
> is there anything to watch out for?
Rejection of mail you wanted accepted, but the best time to watch
out for that is while the safety net is still in place.
--
Viktor.
