On 8/14/2019 10:30 AM, @lbutlr wrote:
Aug 14 09:25:41 mail postfix/smtpd[44179]: NOQUEUE: reject: RCPT from unknown[198.241.168.120]:
550 5.7.25 Client host rejected: cannot find your hostname, [198.241.168.120];
from=<*munged*@*mybak*> to=<lbut...@covisp.net> proto=ESMTP
helo=<cportal3.visa.com>
👹 root@mail # dig cportal3.visa.com +short
[9:27] [/var/log]
198.241.168.120
The help doesn’t match the from, but it is valid.
And yes, this is a BANK, sigh.
smtpd_helo_restrictions = reject_invalid_helo_hostname,
reject_non_fqdn_helo_hostname, check_helo_access
pcre:/etc/postfix/helo_checks.pcre permit
On 14.08.19 10:54, Noel Jones wrote:
This looks like a reject on the client due to failed FCrDNS, not the
HELO.
There's two PTRs for that IP, but only one PTR has FCrDNS. Postfix
will check the first PTR returned, so it's basically random if they'll
get rejected.
If you use reject_unknown_client_hostname be prepared to maintain a
whitelist.
or get the bank to fix it. One rarely needs multiple PTR records.
--
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