I have noticed this super weird behaviour of my webmail installation. I was composing message and clicking send. The message was constantly displayed on the screen, webmail kept displaying “Sending message” info in the bottom right hand corner of the UI and it wasn’t really a mail server’s issue because e-mails were delivered to the recipient few seconds after I’ve clicked send…
It looked like something was “blocking” roundcubemail from “moving forward” after the message was sent.
Thanks to dx I’ve stopped concentrating on roundcube logs and I’ve looked into browser’s error console just to find this:
Timestamp: 15/03/15 09:51:30
Error: Load denied by X-Frame-Options: https://andrzejl.eu:30303/mail/?_task=mail&_unlock=loading1426413090689&_lang=en_US&_framed=1 does not permit framing.
and after few seconds I’ve found this link: http://lists.roundcube.net/pipermail/users/2013-August/009990.html
After #ing out this line:
add_header X-Frame-Options DENY;
in my nginx config and restarting nginx I was back in bees knees.