@nebulon ok thanks for the info, appreciate it.

Can you first confirm that general email sending from your Cloudron works? You can send out a test email from within the status tab in the email view of your Cloudron dashboard. From your screenshot, at least those values look fine. There is no starttls required, since the connection happens on the server local network via port 2525.

@girish Not on 2.3 - 2.2.1 still. I was VERY surprised that my email server became available after re-configuring Rainloop. That's the reason for "WTF" is my list of questions - makes no sense. I was unsuccessful connecting to my mail server from my phone for the whole day - was getting "Auth failed" errors (both from an Android app and Rainloop), so when I got to a computer I've tried it again with no luck. Re-configured Rainloop just for the hell of it and right after that was able to check mail from all my clients. I'll try to see if I can get any logs from docker at this point, not sure if I'll have that. What would be the way to re-start my mail server? docker restart mail should do the job, i hope?

Is there any more information on this? For me all my clients I use, have the option to display folders as threaded or not, they also have then different sorting means depending on threaded or not.

Also, it is safe to disable encryption since the communication is internal to the VM.

Yep! I am on a Lightsail instance and simply needed to open up port 25 for traffic. Thanks!