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I've run my own mail for 10 years (postfix/dovecot/rspamd), no issues. Reverse DNS, SPF, and DKIM records need to be in place, but that's a small lift.

Well, one time I was unable to send mail to a guy with an ancient @att.com email address from his ISP. I got a nice bounce message back with instructions to contact their sysadmins to get unblocked.

To my surprise, they unblocked the IP of my mail server in a matter of hours.

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Private email will have no problems. I also ran my own mail server for personal use and had almost zero problem (and this was on an AWS IP!).

Where people will absolutely have problems is trying to run a marketing campaign through their own IP. You absolutely will (and should) get blocked. This is why these mixer companies exist and why you pay for an intermediary to delivery your mail.

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