I just moved a VPS over to KH from HG. My site has an opt-in mailing list for which press releases and other alerts are sent out. I sent out an email to my members yesterday and to my surprise I received a LOT of mail bounced back. I determined that the bounces were only from users with AOL email addresses. I checked the IP address that my VPS is on and it does not appear to be on any of the blacklists. Has anyone run in to this before with AOL? I submitted a request to AOL to whitelist my IP and it was denied because I don't have a 30 day history of sending mail to AOL users. I'm not sure how I can do that if they are getting bounced in the first place!!! Who uses AOL anymore!? Here's an example of the error: SMTP error from remote mail server after end of data: host mailin-01.mx.aol.com [18.104.22.168]: 521 5.2.1 : (CON:B1) I have learned that according to AOL, that error is: 554 CON:B1 The IP address has been blocked due to a spike in unfavorable e-mail statistics.