can't send aol email

Several years ago I set the internal FQDN as .net for security reason
while our website and email use .org
All was fine until several months ago when AOL and Earthlink began to
view the .net and .org differance as a relay.
I have ensured that the MX records are pointing correctly.
The only remedy I can come up with would be to change the internal
domain to .org which would be a HUGE amount of work since each
workstation would have to be removed and then joined to the new .org
domain.
All of our printed material, etc uses the .org website so changing that
domain name isn't going to happen.
Anyone have any less painful ideas on how to fix this? Your input is
greatly appreciated. Thanks

.

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