Check on your users that send out spam (via different providers) and then link back to AOL. Got several spam pointing to the same address. Really annoying. Don't support it! Just one of the many e-mails, you find the offenders mail address below.
My name is Lerynne West, winner of the Powerball jackpot in 27th October with a prize money of 343 million US dollars. I and my family are organizing the Callum Foundation, named after my grandson, Callum, who was born prematurely in April and lived just a day. The charitable foundation will be focused on making grants to help strengthen the intensive care and emergency units of hospitals in your locality. And also to improve the lives of many individuals and alleviating poverty and hunger in your local area who are affected by this Virus from my $343 million dollars Jackpot winning funds in loving memory of my son.
Contact me through email for more information: firstname.lastname@example.org