Email links broken?

For the last couple months, EVERY time I have used the email link below someone's post to send them a note, the email is returned as "undeliverable."
For most people I communicate with, I have their email so then send it thru normal email.
But something isn't working!

   ----- Transcript of session follows -----
Message:
Returned mail - see transcript for details.

... while talking to mailin-02.mx.aol.com.:
>>> DATA
<<< 521 5.2.1 :  (DMARC:F1) This message failed DMARC Evaluation and is being refused due to the policy provided by the From domain.
554 5.5.0 Remote protocol error
The following message was sent from http://www.naturephotographers.net:   ...........

Sandy
 

I have heard from several people who were able to reach me thru the links. Anyone have any idea what is going on?
Sandy

Sandy, Did you break the internet again? 

The obvious guess is that some members have changed their address since registering. Try sending the email by using the address corresponding to the email tab, the one that npn is using.

Sandy, it looks like AOL is blocking the messages from NPN's server in the case you noted in your original post.

Do all messages you send from the NPN e-mail link get returned as undeliverable, or just some of them?

Sandy, send me a test e-mail using the NPN link below this post and the let us know what happens.

This may something that Jim and Dave the Programmer need to look into.

@Igor: This is not an address issue. It is a protocol error. The returned mail notification would indicate if the address was invalid.
--P
 

Igor, these are sometimes newer members, and I don't think they have changed their emails. It also happens with older members I usually communicate with directly with via regular email - so I know their emails are still  correct.
let's see if we can solve the mystery!
Sandy