ich kann dir Problematik bestätigen, ist bei mir genauso. Der Imap-Dienst meldet "connection lost":
2023-09-07_21:19:06.65811 user=m.niehren@test.tuxlan.de, host=[::ffff:192.168.70.210] message /var/lib/gromox/user/5/0/eml/1694121546.2.tuxgromm-test1.tuxlan.de is appended OK
2023-09-07_21:19:11.49510 user=m.niehren@test.tuxlan.de, host=[::ffff:192.168.70.210] login success
2023-09-07_21:19:11.49702 < 46 uid store 2 +Flags (\Answered): ret=6bch code=1724
2023-09-07_21:19:11.49735 user=m.niehren@test.tuxlan.de, host=[::ffff:192.168.70.210] login success
2023-09-07_21:19:11.50470 user=m.niehren@test.tuxlan.de, host=[::ffff:192.168.70.210] message /var/lib/gromox/user/5/0/eml/1694121551.3.tuxgromm-test1.tuxlan.de is appended OK
2023-09-07_21:19:19.26858 user=m.niehren@test.tuxlan.de, host=[::ffff:192.168.70.210] login success
2023-09-07_21:19:30.05767 < 48 uid store 2 +Flags (\Answered): ret=6bch code=1724
2023-09-07_21:19:30.05881 user=m.niehren@test.tuxlan.de, host=[::ffff:192.168.70.210] message /var/lib/gromox/user/5/0/eml/1694121570.4.tuxgromm-test1.tuxlan.de is appended OK
2023-09-07_21:19:30.05953 < 70 noop: ret=6a6h code=1702
2023-09-07_21:19:50.07735 user=m.niehren@test.tuxlan.de, host=[::ffff:192.168.70.210] connection lost
es passiert aber nicht immer