AOL SMTP response code

AOL SMTP response code

AOL SMTP Response Code

Some AOL mailers are experiencing a new SMTP Response code from remote mail servers:

521 5.2.1 :  AOL will not accept delivery of this message.

If you’re seeing this response code, please double check your System > Bounce Cleaner page from the Admin UI.

Verify that Volo is setup to detect a rule and assign a bcount value of 0 if you’d like you’d like to disregard this bounce.

For any questions, please email or