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 mylist@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=<mylist@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.ht...
?
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan