DavidT Posted September 12, 2012 Share Posted September 12, 2012 After trying to send to several AOL addresses this morning, including my own, I've been receiving this error: The following message to <[removed][at]aol.com> was undeliverable. The reason for the problem: 5.1.0 - Unknown address error 521-'5.2.1 : (CON:B1) http://postmaster.info.aol.com/errors/554conb1.html' If you go to the URL, you'll see that the 500-level "CON:B1" status translates to: "The IP address has been blocked due to a spike in unfavorable e-mail statistics." Email_Support! You now need to make nice with the AOL Postmaster department (they have procedures, as I'm sure you're aware). Please do so ASAP, as I have more people with AOL addresses with whom I need to communicate than Hotmail/MSN addresses. Link to comment Share on other sites More sharing options...
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