Please log in to access Return Path product content. If you are a SFMC customer, please log in to your SFMC account to access additional Return Path Help Center content. Everest, BriteVerify and 250ok customers do not need to log in to access Help Center content.
What is HELO?
Kent McGovern
HELO is a Simple Mail Transfer Protocol (SMTP) command sent by an email server to identify itself when connecting to another email server to start the process of sending an email. It is followed with the sending email server's domain name.