Accept all valid email addresses
I have an email address with .eu as the domain. (I own bobnelson.eu.) AOL's email system simply ignores it. You have crazy "security" rules, with a ton of robot detection... and insanely rigorous password rules... but you simply trash some perfectly valid email addresses.
Yuma AZ & Calais France
Robert Nelson commented
I presume you're unaware of this situation... which is kinda significant, don't you think?