It’s not too bad if you use an outbound SMTP relay for sending. SMTP2Go is pretty good, and they have a free plan with 1000 emails per month. I use Mailcow and you can configure relays in their web UI, but it works just as well with the sender_dependent_relayhost_maps setting in Postfix.

Sure, it’s not fully self-hosted, but the interesting part to self-host is the storage of your emails, not the sending (which will just relay through other SMTP servers along the way anyways).