Tried to create a new contact for and got a message that this isn't a valid email address. It is, because I've received email from it. Can you help?
Thanks for reaching out to the Community! We usually see this issue when there is a special character in the address, which wasn't the case here, so I was surprised to see that same error when I tried to add a single contact. When I tried the Type In Or Paste option I was able to get the address added without issue. You can find it in a list titled "Added by Constant Contact."