While trying to send an email from my work's domain I receive a bounce back in about 4hrs so the email does not reach the targeted person. I have send an email from Hotmail account to the same AOL address just to receive another bounce back. I have also tried sending an email from Gmail to AOL which resulted in no bounce back but the AOL user did not receive the email. I can receive an email from AOL. Is anybody else having similar problem? What would be the best course of action to resolve this? Thanks
Edit:
The following is the bounce back on the hotmail account.
< #5.1.1 smtp;550 5.1.1 : Recipient address rejected: aol.com> #SMTP#
Edit 2:
What I have got from Mailserver is an error #4.4.7 which according to Microsoft:
typically indicates an issue on the receiving server. Verify the validity of the recipient address, and verify that the receiving server is configured to receive messages correctly