

I’m not too concerned, for example, if they have to check their spam folders. As long as the email still lands.
In that case, it really isn’t that much of a hassle. A basic mail system isn’t that complicated to set up (just make sure you have proper authentication and such, don’t host an open relay!). I actually did this not too long ago, using maddy, which unlike the traditional postfix+dovecot setup (which I had also been looking into) means you don’t even have to host separate services for SMTP and IMAP, and it also automates most additional things that are necessary nowadays for you, like TLS, DKIM, DMARC, and so on. Not quite everything though, there’s still stuff needed to do manually, mostly to set the SPF and DMARC records in the DNS, but it’s been working really well so far.
And really, the only mail provider you have to worry about for putting your mails into spam is gmail. They’re the worst. (maybe microsoft-hosted outlook too, but I haven’t encountered anyone using that)



On residential connections, that’s probably the case, yes. I’m hosting it on a VPS though and have had no problems with blocked ports so far. I imagine it depends on the provider?