Sending Test Challenge Causes Black Listing - KB Article #1337Related Articles --
Some SMTP servers require authentication even when sending a message to your own address. When that is the case, Zaep may be unable to send a test challenge message. If after sending a test challenge message your email address appears in the black list, this is likely the reason.
To test Zaep when this occurs, we recommend that you use a free email account from yahoo.com or hotmail.com. Click here (article 1321) to read more information about testing challenge messages.