I gave it 1 hour 15 minutes and same issue so it doesn’t appear to be rate limited.
You probably want to post a topic in #bug.
Give a repo on no staged users and a brand new email.
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@jordan1909, just remember something.
Did you check Admin->Settings->Email->Skipped
to see if your email has been skipped for some reason?
Turns out that you’ve hit a throttle limit after all.
https://github.com/discourse/discourse/blob/master/lib/email/processor.rb#L87-L90
Ends up that the same rejection email is only sent once per day to each email address.
You may try sending the email after 24 hours to see if you get a rejection again.
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Holy crap that was it. How did I not see that 
1x per day should be sufucient. Thank you for all your help.
Any thoughts to making this a site setting? I personally would see it being nice to have as configurable.
Something like: email_rejection_interval or something along those lines?
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