All entries need to be linked to an Email Address that belongs to you. It is for this reason that all Email Addresses are validated.
If your SC International Username is a valid email address then you are already validated.
If you are accessing the system for the first time you will be sent an email with a link that will validate the Email Address. An Email Address is only validated once and will remain validated on your return visit even if it is to place an entry for a different competition.
Collection of your Email Address is for the sole purpose of contacting you about matters concerning your Entry & Competitions. At no time will your Email Address (or any other personal information) be passed on to a third party.