On 6/8/25 16:04, Florian Sukup wrote:
Postfix on its own is working fine.
I set up mailman, created a site/domain (lists.yyy.com). My hostname is
host.xxx.com . My IP has a RDNS entry: reverse.rrr.com .
Why is the RDNS to reverse.rrr.com and not host.xxx.com. It is important
for mail delivery to have full circle DNS. I.e. the sending server
should have an A record for its IP and revers DNS for that IP should
point back to the sending server's name. I'm guessing that rrr.com is a
hosting provider and you don't control the rDNS for that IP, but you
should try to get them to change it for you. Without that change,
delivery of your outbound mail, at least to large ISPs, will be
problematic at best.
When I send an email to my mailing list myl...@lists.yyy.com I receive
an error email. The logfile says the following:
...
Jun 9 00:23:38 arvak postfix/smtpd[]: connect from host.xxx.com[m.y.i.p]
Jun 9 00:23:38 arvak postfix/relay/smtp[]: warning: host
reverse.rrr.com[178.251.71.190]:25 greeted me with my own hostname
host.xxx.com
Jun 9 00:23:38 arvak postfix/relay/smtp[]: warning: host
reverse.rrr.com[m.y.i.p]:25 replied to HELO/EHLO with my own hostname
host.xxx.com
See above.
Jun 9 00:23:38 arvak postfix/relay/smtp[]: 094895FADB:
to=<myl...@lists.yyy.com>, relay=reverse.rrr.com[m.y.i.p]:25,
delay=0.06, delays=0.03/0.01/0.02/0, dsn=5.4.6, status=bounced (mail for
lists.yyy.com loops back to myself)
What is the output from `postconf -n`?
Jun 9 00:23:38 arvak postfix/smtpd[114119]: disconnect from
host.xxx.com[m.y.i.p] ehlo=1 quit=1 commands=2
...
The MX record of lists.yyy.com points to reverse.rrr.com. Not sure if
this is the best idea?
reverse.rrr.com has no A or AAAA record. An MX MUST point to a domain
that has an A or AAAA record. The MX should point to host.xxx.com.
Can anyone give me a hint where to search for this error?
The output from `postconf -n` would help. Also, have you set up postfix
per
https://docs.mailman3.org/projects/mailman/en/latest/src/mailman/docs/mta.html#postfix
?
--
Mark Sapiro <m...@msapiro.net> The highway is for gamblers,
San Francisco Bay Area, California better use your sense - B. Dylan
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