What is my https://spam.his.com password?

Your username and password on https://spam.his.com are your email address and your email password.

Log in at https://spam.his.com using your email address user@mydomain.com and the password that you use to pick up your mail.

Note: if you have your user@mydomain.com mail mapped to a mail.his.com mailbox, log in using the mail.his.com username (user123@his.com) and password.