So I know I've seen this issue talked about, but I'm not finding anything in a Google search, and getting literally zero results for anything with "yahoo" on the forums here.   ... Yahoo email addresses break the contact form. The reply-to grabs some wordpress email and not the customer's email. I know this is a known issue, I know there was a fix, I just can't find it. ^^! 

Can anyone point me to that post?
Thanks!