I've got the same problem Matthias since moving. The new ISP only supports SSL/TLS encrypted SMTP on port 465 which AutoTroll can't do. We asked Red Troll to add this years ago when he offered to do some upgrades but instead of doing that he disappeared.
Looked into Hamster (and a bunch of other stuff) and it's kinda messy. If I remember correctly I found an updated version of Hamster, maybe something similar that had a GUI versus all scripts.
I have to say that with the changes that have gone on in my life and work since the end of 2016 I just haven't had the time to spend on CM the way I want to and honestly after running the site for 10 years without any major downtime, the break has been nice.
Bitmask and I need to get together at some point and figure out how we want to move forward. Hopefully that will happen soon.