Hello,
I like to access the mailboxes via IMAP in Thunderbird.
Running an update does not present any new package, therefore the following two packages should be the most current ones:
gromox-3.3.12.mb55a6fa-lp156.16.1.x86_64
grommunio-release-2025.1.2-lp156.3.1.x86_64
The IMAP-Server is active, the firewall deactivated and the access to the IMAP server is allowed in the users profiles:
grommunio2:~ # systemctl status gromox-imap
● gromox-imap.service - Gromox IMAP server
Loaded: loaded (/usr/lib/systemd/system/gromox-imap.service; enabled; preset: disabled)
Active: active (running) since Mon 2026-01-12 22:57:10 CET; 9h ago
Docs: man:imap(8gx)
Main PID: 4872 (imap)
Tasks: 24 (limit: 4915)
CPU: 35.821s
CGroup: /system.slice/gromox-imap.service
└─4872 /usr/libexec/gromox/imap
Jan 12 22:57:11 grommunio2 imap[4872]: [imap]: context average mitem number is 65536
Jan 12 22:57:11 grommunio2 imap[4872]: [imap]: imap socket read write timeout is 3min
Jan 12 22:57:11 grommunio2 imap[4872]: [imap]: imap session autologout time is 30min
Jan 12 22:57:11 grommunio2 imap[4872]: [imap]: maximum authentication failure times is 10
Jan 12 22:57:11 grommunio2 imap[4872]: [imap]: block client 1min when authentication failure count is exceeded
Jan 12 22:57:11 grommunio2 imap[4872]: [imap]: TLS support enabled
Jan 12 22:57:11 grommunio2 imap[4872]: [system]: system TLS listening port 993
Jan 12 22:57:11 grommunio2 gromox-imap[4872]: system: maximum file descriptors: 524288
Jan 12 22:57:11 grommunio2 gromox-imap[4872]: ldap_adaptor: default host <ldapi:///>, base <>, #conn=8, mailattr=mail
Jan 12 22:57:11 grommunio2 imap[4872]: [system]: IMAP DAEMON is now running
After configuring Thunderbird, tcpdump displays that communication between client and server, but TB still says "Connected to grommunio2.xxx.de" and that's it:
08:54:58.861602 IP (tos 0x0, ttl 47, id 41109, offset 0, flags [DF], proto TCP (6), length 52)
212.172.yyy.yyy.45548 > 10.0.0.2.993: Flags [S], cksum 0xd3e1 (correct), seq 3293790319, win 64240, options [mss 1452,nop,nop,sackOK,nop,wscale 7], length 0
08:54:58.861639 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 52)
10.0.0.2.993 > 212.172.yyy.yyy.45548: Flags [S.], cksum 0xe5dc (incorrect -> 0x60b7), seq 3253317927, ack 3293790320, win 64240, options [mss 1460,nop,nop,sackOK,nop,wscale 7], length 0
08:54:58.862205 IP (tos 0x0, ttl 47, id 47317, offset 0, flags [DF], proto TCP (6), length 52)
212.172.yyy.yyy.45560 > 10.0.0.2.993: Flags [S], cksum 0x899b (correct), seq 1999624141, win 64240, options [mss 1452,nop,nop,sackOK,nop,wscale 7], length 0
08:54:58.862221 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 52)
10.0.0.2.993 > 212.172.yyy.yyy.45560: Flags [S.], cksum 0xe5dc (incorrect -> 0xd8dd), seq 2695368700, ack 1999624142, win 64240, options [mss 1460,nop,nop,sackOK,nop,wscale 7], length 0
........
Although there are emails in the inbox and additional subfolders, they are not displayed in Thunderbird.
Is this a problem of Thunderbird or of gromox-imap?
How can I debug gromox-imap? Adding "log_level=6" to /etc/gromox/imap.cfg didn't change anything.
Thanks for any help or suggestion,
Stefan
