Usability:
If the user signs up with an email from a well known web mail provider (e.g. gmail, yahoo, hotmail/outlook, etc.) then in the registration confirmation instead of a message saying "You can close this window now" provide a link to the relevant mail service.
For example: "Check your mail on "
Usability: If the user signs up with an email from a well known web mail provider (e.g. gmail, yahoo, hotmail/outlook, etc.) then in the registration confirmation instead of a message saying "You can close this window now" provide a link to the relevant mail service. For example: "Check your mail on"