Could I solve this by setting smtp_helo_name in main.cf to
77-172-184-9.fixed.kpn.net ?
Or is this a bad idea?
On 11.04.22 10:20, post...@ptld.com wrote:
Yes you can set the helo name to match but this wont have much effect.
Some servers are looking at domain -> IP -> domain which in your case is:
mail.linetec.nl -> 77.172.184.9 -> 77-172-184-9.fixed.kpn.net
I don't think anyone resolves DNS in this order.
(and any indication of this may lead to false assumptions which is why I'm
saying this).
the reverse DNS check usually goes like this:
77.172.184.9 -> 77-172-184-9.fixed.kpn.net -> 77.172.184.9
with the latter part sometimes ignored.
helo check goes like this:
"helo mail.linetec.nl" => mail.linetec.nl -> 77.172.184.9
with postfix, the first check is done by reject_unknown_client_hostname or
the shorter way (without host=>IP resoluntion) by reject_unknown_reverse_client_hostname
the helo check is done by reject_unknown_helo_hostname.
however there are many mailservers who consider "77-172-184-9.fixed.kpn.net"
generic (because it contains the IP address) and refuse talking to server.
--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
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