Sending Email to AOL Mail accounts

Sending Email to AOL Mail accounts

For whatever reason emails that I have been sending from a POP3 account that I have configured on Zoho have not been going through to AOL mail.  I have been using Zoho for about two weeks and this problem only cropped up yesterday.  To the best of my knowledge my mail is going through to other domains, but I am obviously concerned as I am relying on it.  Just looking for a little help/advice.