Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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It doesn't, but I wouldn't recommend selfhosting email for a small org. The low price of Office 365 or whatever Google is calling their business product now is far cheaper than the anguish of running your own server and dealing with spam, both incoming and making sure there's none outgoing, and making sure your recipient servers aren't considering your spam.
Our small mail server is doing OK. Incoming spam is an issue but not a massive problem. Outgoing spam doesn't exist. Once a year the IP ends up on the Microsoft blocklist but using the deliverability form to submit mitigation requests is easy enough and takes half a day or so to sort out.
I'm looking forward to seeing what the Thunderbird team does with Stalwart.
That reminds me I've been meaning to spin up a server, install Stalwart and test it out.
If you're running an email server for more than a handful of persistent users, I'd probably agree. However, there are self-host solutions that do a decent job of being 'all-in-one' (MailU, Mailcow, Docker-Mailserver) that can help perform a lot of input filtering.
If your small org just needs automation emails (summaries, password resets), it's definitely feasible to do actually, as long as you have port 25 available in addition to 465, 587 and you can assign PTR records on reverse DNS. Optionally you should use a common TLD for your domain as it will be less likely to be flagged via SpamAssassin. MXToolbox and Mail-Tester together offer free services to help test the reliability of your email functionality.