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The original was posted on /r/selfhosted by /u/FloppyDiskMuffin on 2023-07-04 06:53:56+00:00.

I wrote a program in Go behind a private HTTP API that is hit by Uptime Kuma every 60 seconds. The API invokes a send and receive between 2 different mailboxes to ensure SMTP and IMAP are working correctly against my mailcow instance behind my reverse proxy.

If this fails, I get a notification instantly via self-hosted Ntfy push server, which I’m subscribed to on my phone.

What do you guys do for SMTP/critical services to ensure uptime is good/security not breached.

I’ve been deep diving some networking/alerting with email all day and wanting to write a couple blog articles about it since I’ve invested a ton of time and nothing very good exists online outside the Mailcow docs.