I am using smtp2go to send out emails from my own services. The free plan allows 1k emails per month.

You can set up your domain and it sends fine.

For my own mail I use Fastmail and it is great. If the smtp from apps is the only issue then smtp2go might be solution?

100% agree, when I received the email I got really bad vibes from the whole thing.

I am sure they will come back and say "ah sorry our bad, we will fix this" but once the trust is broken like this, nah I'll go to jellyfin thanks.