SMTP Notifications setup problem

Describe your problem Setup notifications with smtp not working with selfhosted mailcow mail-server. I have the correct hostname, port and authentication settings because I tested it with a different software for mail notifications. What I am curios about is, that in the logs it has connect ECONNREFUSED XXX.XXX.XXX.XXX:465 and not the actual hostname with domain. Maybe I understand SMTP or mail wrong but I thought it requires the use of the hostname for secure connections. In the working version in the other software it won’t work with the ip address so I though maybe that’s the problem.

Info Uptime Kuma Version: latest Using Docker?: Yes Docker Version:20.10.9 OS: ubuntu-21-04

[louislam]

In my opinion, iptables is not for human, I honestly cannot master it, even though I used CentOS 7 for many years.

Would suggest to turn off the firewall for a short time and test it again, which can make sure that the direction is correct first.

[louislam]

Even with STARTTLS 587 it doesn’t work. I think I messed something up somewhere with my mail config in mailcow or so but I’m still very confused on why it works with my game panel (pterodactyl)

I think you can set a TCP monitor, see if Uptime Kuma can connect to your mail server first.