Egregoros

@NebulaTide
Thanks!

You could consider a hybrid approach: start with hosting the incoming e-mail yourself and send out via a relay server. When all is running as expected, start sending out some mails via your own server and test deliverability.

So far I have not experienced delivery issues, for example with a custom relay server that runs for 10+ years now.
@stefano

@mboelen @NebulaTide I've been self-hosting my e-mails since 2001, never moved them to any external provider. If you configure everything in the proper way, they will arrive.
I've seen more Microsoft -> Google, Google -> Microsoft and (yes, incredibly) Google -> Google failures than with custom mail servers