I try to set an auto responder in a mailbox, but roundcube does nothing, when pressing the Save button. The roundcube error log says: Code: [03-Feb-2025 09:07:03 UTC] PHP Warning: Undefined array key "autoresponder_subject" in /usr/share/roundcube/plugins/ispconfig3_autoreply/ispconfig3_autoreply.php on line 200 [03-Feb-2025 09:07:03 UTC] PHP Warning: Undefined array key "autoresponder_text" in /usr/share/roundcube/plugins/ispconfig3_autoreply/ispconfig3_autoreply.php on line 205 Roundcube is extremely slow. I rebooted the server already, no change.
I found the root-cause. It's because I locked Port 8080 from external except for my IP. Which IP needs access from external for roundcube to work correctly?
Every IP of course! Unless you have a list of all your clients IP's. Than you can use that. Or set-up a publicaly available proxy in front. Than only that proxy needs access.
In addition to what @remkoh posted, you can also install a separate version of a webmail client into a website so you can reach it on port 443. And just to note, webmail is port 8081, port 8080 is ISPConfig.
