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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Well…it is a potential risk that links back to you pretty much directly. What is stopping some rogue sw from sniffing out smtp and then going bananas?
I would look for other ways tbh. Running smtp locally is imo asking for trouble.
It's behind a firewall for one. But even so, you should configure it to only accept connections from the local network, only send via 365, and only to your own address, then the scope is vastly reduced.
threat & impact is essentially identical => "so for SMTP on all my devices at home"; the home environment is a bit swampy, a mix of protected and unprotected network.
A worm/bot sending out mass emails from Business 365 would be perceptually damaging to the business; would advise against SMTP and instead look at other secure methods of provisioning identity that are not quite as labor intensive as sticking credentials in each nook and cranny. Or...simply don't utilize O365....