Mail Delivery Status Notification (Delay)

Mail Delivery Status Notification (Delay)

Is there anything I can do to avoid the following? I am getting the following from AOL Addresses:

This message was created automatically by mail delivery system.

 

THIS IS A WARNING MESSAGE ONLY.

 

YOU DO NOT NEED TO RESEND YOUR MESSAGE.

 

The original message was received at Tue, 02 Dec 2014 20:59:49 -0800  from roy@fscoi.com [roy@fscoi.com]

 

    ----- The following addresses had fatal errors -----   

   [Status: Error, Address: <wknt03@aol.com>, ResponseCode 421, , 4.7.1 : (DYN:T1) http://postmaster.info.aol.com/errors/421dynt1.html, Status: Error, Address: <jonjenk@aol.com>, ResponseCode 421, , 4.7.1 : (DYN:T1) http://postmaster.info.aol.com/errors/421dynt1.html]

 

Message will be retried for 4 more day(s)