Why are my Yahoo & Hotmail email addresses being identified as invalid? by Database Marketing | Jun 22, 2016 | | 0 comments It’s because we do not have the access to the email servers. The servers may choose not to validate out-source emails. Submit a Comment Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.