Adding a bit to that, the real question is how you want the mail to flow. An MTA like Postfix will manage its own queue, so your program writes out a mail message and gets "success" that it has been delivered to Postfix. If Postfix has a problem delivering it, you'll need separate monitoring to find out about that, and meanwhile the messages will pile up in the queue on the raspberry Pi. The other way is to deliver mail directly from your app to some external SMTP host, like a relay service from your internet provider, or SendGrid, or something like that. If you can't push the message to them, the error can be handled and reported in the application. This also saves you the hassle of setting up an MTA, which is nice, unless your whole goal was to learn about MTAs.
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