If you’re still unsure, I’d say try running your own email server (it’s free afterall)
When to Use a Third-Party Mailing Service and When to Host Your Own Email Server
Feeling OK
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It’s free if and only if your time is worth nothing, and you’re willing to accept the risk of things breaking at inconvenient times. I’ve enjoyed running a mail server in the past, but the rigmarole of running and locking down SMTP and IMAP servers, keeping up with disappearing anti-spam blacklists, handling anti-spam authentication DNS mechanisms, and being on call in case of emergency— it’s a lot to ask of someone.

When in doubt, it’s best to avoid complexity.

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