Why is an AOL email address rejecting a forwarded notification?

Notification of a file upload comes to me at my domain (uhpress.com).  Once I verify authenticity, I forward the email to a co-worker whose email is @aol.com.  Just today those emails are being rejected.  Here is the message I receive:

Your message did not reach some or all of the intended recipients.

      Subject:    FW: New submission: uhpress.com Place an Order Form
      Sent:    10/8/2014 11:46 AM

The following recipient(s) could not be reached:

      ------an@aol.com on 10/8/2014 11:46 AM
            mailin-04.mx.aol.com: 521 5.2.1 : (HVU:B2) http://postmaster.info.aol.com/    errors/554hvub2.html

Thanks Shadae.

Yes, the issue only occurs when forwarding a Jotform notification email.  In fact, when we removed the links to the files, the email DID go through.

We could easily add this person to the notification list, but he would be inundated with notifications -- some of which do not apply to him. 

Like I said, this method had worked perfectly for us until this week.

You can use conditional logic to send emails. In fact, you are using this method to your current form. Why not add this recipient using conditional logic so you're sending emails based on the information that should be for this recipient?

Well, try to ask this person to whitelist Jotform by adding noreply@jotform.com to his/her safe sender list. Also ask this person to add your email address to safe sender list, if you're forwarding the submission using your own email address. Whitelisting should help. 

http://womeninbusiness.about.com/od/email-questions/f/How-Do-I-Whitelist-Email-Sender-Or-A-Domain-In-Aol.htm 

Thank you!

Sorry, the correct link is: http://womeninbusiness.about.com/od/email-questions/f/How-Do-I-Whitelist-Email-Sender-Or-A-Domain-In-Aol.htm.

Thank you!