Pretty nice but way more expensive then simplymail

I’ll second PurelyMail. Easy to set up and they have explainers for all the various settings. I pay $10 a year for “unlimited” domains and mailboxes (some caveats but for minimal mail we won’t hit any limits).

I bet op is one of those hippies that doesn't like their SMTP tested on animals

Mostly that they respect the privacy of my users and that they don't have shady business practices that want to push you towards an over-expensive paid tier.

Amazing! Now this is something I haven't heard of. I think we might have a winner here! Best thing, I could use it for transactional mail on all my websites for 10€/yr. Including as many inboxes as needed. Nice!

I specifically want to not deal with deliverability beyond the content and volume of my mails.

Agreed, and well-articulated. I think you (OP) need to ask yourself whether you’re willing to pay the appropriate market rate for the service or not. I don’t know what that is, but I expect it’s higher than you’ve expressed.

Thanks but that's not what I'm looking for. I need to send mails only.

A few hundred a month is just a few per day. That is pretty low volume by most standards.

I would say in general if the SMTP server could be replaced by a single human writing and mailing snail-mail letters by hand it qualifies as low volume.

This is something you used to be able to do for free, no problem. It's only a few of the big mail accepting companies being extra shitty about accepting mail making this tough. Looking at you Microsoft. So a few hundred mails per month is ridiculous both on storage, bandwidth and CPU consumption.