From Online Manual
description: The url tag makes email hyperlinks. If a single email adress is placed inside the tags, then a link will be made to that email. These links will be opened with the user's default email
[firstname.lastname@example.org]text or more BB Code[/email]Links with descriptions can be made using this format. This is an inline tag and no block level tags can be placed inside, however other inline tags can be if nested correctly, with the exception of the email, ftp, iurl and url tags.text or more BB Code email@example.com Email addresses will also be auto-linked. If this is not desired, the nobbc tag can be used.