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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What happens if your server is offline and an email comes in? I'm genuinely curious what it would do. Or must you VPS host your mail server for maximum uptime?
The other server sends again until it times out? Never been an issue, that's just how email works. Most SMTP servers will attempt for a few days if they know the MX is valid. Besides, I've never been out for longer than an hour or two.
All MTAs have retries baked in, so running a self-hosted email server that receives mail is actually one of the most forgiving services in this respect. If your server is offline, the sending server will retry several times over 24-48 hours before it gives up. Even the big cloud email providers will do this.
That said, there are other aspects of running an email server that require some extra rigour, but they're more on the sending side (making sure emails you send to other people actually land in their inbox). Doable, but one of the more challenging things to self-host.