Email address "not valid?"

 I received a letter this week, congratulating me on my membership renewal, which is fine. But it says "review email on file: None" and also "You are receiving this confirmation letter via mail because we do not have your email address or the email address we have on file is not valid." Yet my email address IS here in my account, and AARP sends me emails.   Both the emails and the letter do have the same membership number and other info.  How can I fix this? Also, why is there no way to email someone for help instead of having to post here wait until 8am to find a real life person?  Thanks for any help!