[palata]

Have you considered Migadu? I don't have shares there, just a very happy customer :-).

[litmus-pit-git]

I did. Their 20 out/day (soft limit) had me concerned. While many weeks I might send less than 7 emails I still feel uncomfortable with those limits.

[palata]

As you said, those are soft limits, i.e. there is a human on the other side. If they feel like you use more than you should, they will talk to you instead of kicking you out.