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I've been running my own mail servers since 1994. I started with smail, then sendmail, then qmail, various pop3 and imap servers, now postfix and dovecot If you set it up and do it right, which means SPF, DKIM, DMARC these days, plus obviously basics like reverse DNS, it is almost trouble free.

Making sure your service is always available isn't even necessary. Queuing and retries are built into the SMTP protocol. I run my servers off a cable modem and I easily have 99.9% availability.




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