Spam probably isn't as bad as you think it is. It's not the dark old days where 99% of emails are spam.
You should self-host, so you can do the experiment for yourself. You might be surprised. You can always stop self-hosting if you don't like it.
You should self-host, so you can do the experiment for yourself. You might be surprised. You can always stop self-hosting if you don't like it.
For some time it was possible to just send a special request to the provider asking them to unblock the port, but this is becoming less common, for often they simply deny the request.
Users who have been hosting their own email for many years have often been grandfathered in so they might not even be aware of this.