[exim] 4.95 failed to stat log directory /var/spool/exim/log…

Hi all,

Recently my mailman 3 servers began spamming with tons of such log messages:
cannot accept message: failed to stat log directory /var/spool/exim/log: Permission denied

root@lists5:/var/spool/exim # ls -ld .
drwxrwx--- 5 mailnull mail 5 May 18 05:45 .
root@lists5:/var/spool/exim # ls -l
total 10
drwxr-x--- 2 mailnull mail 8 Jan 18 20:17 db
drwxr-x--- 2 mailnull mail 2 May 18 03:01 input
drwxr-x--- 2 mailnull mail 2 May 18 03:01 msglog

root@lists5:/var/spool/exim # id 26
uid=26(mailnull) gid=26(mailnull) groups=26(mailnull)

user mailman is in the mail group.
Should it be in the mailnull group?

What is the correct setup?

Any help appreciated,
Axel
---
PGP-Key: CDE74120 ☀ computing @ chaos claudius