On 6/13/25 01:58, Mark Sapiro wrote:
On 6/12/25 15:05, Florian Sukup wrote:

I always restart mailman3 after changing main.cf

I asked if you restarted/reloaded Postfix. I would assume that you had,

Sorry, I meant postfix which I restart after changing main.cf or master.cf.

but I'm at a loss to understand the issue, unless your /etc/postfix/master.cf is missing an uncommented entry for lmtp like
```
lmtp      unix  -       -       y       -       -       lmtp
```


I found it there, here is my master.cf:
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
smtp      inet  n       -       y       -       -       smtpd
submission inet n       -       y       -       -       smtpd
  -o syslog_name=postfix/submission
  -o smtpd_tls_security_level=encrypt
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_sasl_type=dovecot
  -o smtpd_sasl_path=private/auth
  -o smtpd_tls_auth_only=yes
  -o smtpd_reject_unlisted_recipient=no
pickup    unix  n       -       y       60      1       pickup
cleanup   unix  n       -       y       -       0       cleanup
qmgr      unix  n       -       n       300     1       qmgr
tlsmgr    unix  -       -       y       1000?   1       tlsmgr
rewrite   unix  -       -       y       -       -       trivial-rewrite
bounce    unix  -       -       y       -       0       bounce
defer     unix  -       -       y       -       0       bounce
trace     unix  -       -       y       -       0       bounce
verify    unix  -       -       y       -       1       verify
flush     unix  n       -       y       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       y       -       -       smtp
relay     unix  -       -       y       -       -       smtp
        -o syslog_name=postfix/$service_name
showq     unix  n       -       y       -       -       showq
error     unix  -       -       y       -       -       error
retry     unix  -       -       y       -       -       error
discard   unix  -       -       y       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       y       -       -       lmtp
anvil     unix  -       -       y       -       1       anvil
scache    unix  -       -       y       -       1       scache
postlog   unix-dgram n  -       n       -       1       postlogd
maildrop  unix  -       n       n       -       -       pipe
  flags=DRXhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
uucp      unix  -       n       n       -       -       pipe
flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
ifmail    unix  -       n       n       -       -       pipe
  flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp     unix  -       n       n       -       -       pipe
flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
scalemail-backend unix -       n       n       -       2       pipe
flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
mailman   unix  -       n       n       -       -       pipe
flags=FRX user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py ${nexthop} ${user}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Is the last line a problem? It seems to be from mailman2.

Is there a possibility to debug in more detail? To find out when and where it takes the wrong turn?

The system running has grown over many years and even if the hardware changed the configuration was kept. So there may a flaw outside the postfix/mailman configuration which causes the error, ie. network configuration.

Another thing I can do is to upgrade from bullseye to bookworm. Which I haven't done yet because I was with mailman2/sendmail. That's the reason to change to mailman3/postfix. Since, mailman2 doesn't work anymore I could do it and hope for a miracle ... . This would mean postfix 3.5.25 -> 3.7.11 and mailman3 3.3.3 -> 3.3.8 . That's more an act of desperation.

Thanks for your help,
Florian.
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