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cullumsmith | 5 months ago
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.
everfrustrated|5 months ago
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.