Below are the warning messages from Cleanup of Temporary Directories about
drop-in file from dovecot:

Feb 03 17:39:44 rpi4-152 systemd[1]: Starting Cleanup of Temporary
Directories...
Feb 03 17:39:44 rpi4-152 systemd-tmpfiles[2060]:
[/usr/lib/tmpfiles.d/dovecot.conf:2] Line references path below legacy
directory /var/run/, updating /var/run/dovecot/ ��� /run/dovecot/; please update
the tmpfiles.d/ drop-in file accordingly.
Feb 03 17:39:44 rpi4-152 systemd-tmpfiles[2060]:
[/usr/lib/tmpfiles.d/dovecot.conf:3] Line references path below legacy
directory /var/run/, updating /var/run/dovecot/login/ ��� /run/dovecot/login/;
please update the tmpfiles.d/ drop-in file accordingly.
Feb 03 17:39:44 rpi4-152 systemd-tmpfiles[2060]:
[/usr/lib/tmpfiles.d/tmp.conf:13] Duplicate line for path "/var/tmp", ignoring.
Feb 03 17:39:44 rpi4-152 systemd-tmpfiles[2060]:
[/usr/lib/tmpfiles.d/var.conf:21] Duplicate line for path "/var/lib", ignoring.
Feb 03 17:39:44 rpi4-152 systemd-tmpfiles[2060]:
[/usr/lib/tmpfiles.d/var.conf:23] Duplicate line for path "/var/spool",
ignoring.
Feb 03 17:39:44 rpi4-152 systemd[1]: Started Cleanup of Temporary Directories.