Self-host, easy. No matter the hordes of detractors who will tell you this is impossible and that all your mail will be /dev/nulled by all the usual suspects (Microsoft, Microsoft and Microsoft being the main culprit here, Gmail comes in second) the truth is that you'll be fine as long as you make sure to configure things like SPF and DKIM correctly and you're either using a smarthost for outgoing mail (ask your IAP whether they provide one) or are on a reputable network.
A SBC like a Raspberry Pi is sufficient to host mail services for a fairly large number of people. Filter out spam with Spamassassin and a greylist, run sieve to organise your incoming mail flow, use specific mail addresses when communicating with commercial and government organisations and you'll end up asking yourself why so many people insist that self-hosting mail is not an option.
Now that you're self-hosting mail you can also self-host XMPP using the same address making it possible for people to reach you through either SMTP (mail) or XMPP (instant messaging/voice/video calling) using that address. This can be hosted on that same SBC without problems.
Source: my own experience self-hosting mail (and more) since the 90's. If it worked on a 486DX2-66 it should work on a quad-core 1.5GHz 64-bit ARM...
A SBC like a Raspberry Pi is sufficient to host mail services for a fairly large number of people. Filter out spam with Spamassassin and a greylist, run sieve to organise your incoming mail flow, use specific mail addresses when communicating with commercial and government organisations and you'll end up asking yourself why so many people insist that self-hosting mail is not an option.
Now that you're self-hosting mail you can also self-host XMPP using the same address making it possible for people to reach you through either SMTP (mail) or XMPP (instant messaging/voice/video calling) using that address. This can be hosted on that same SBC without problems.
Source: my own experience self-hosting mail (and more) since the 90's. If it worked on a 486DX2-66 it should work on a quad-core 1.5GHz 64-bit ARM...