When a user Joins

HI.

When a user Joins my site at http://www.taggedbyanangel.com/register/

The user receives an email. This email is generally seen as spam to GMail and I can see why, it is not formatted well, does not include the user's password and contains very little text.

Example in spam box: http://www.screencast.com/t/sUrIrjrKqW

Example Email: http://www.screencast.com/t/aUk04iqHVS

How do we format this message better so it is not seen as spam and includes welcoming text and the user's chosen password for their records?

Please advise.