Update mail component:

* Uses adapters.
* Throws exceptions.
* Chainable.

This allows free customization of anything, and actually
knowing what went wrong in the chain, rather than just
getting a boolean.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5612 2fea6a4d-a838-0410-917b-93a53c48e9d2
Correct documented return value.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5613 2fea6a4d-a838-0410-917b-93a53c48e9d2
Unnecessary leftover.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5614 2fea6a4d-a838-0410-917b-93a53c48e9d2
LF.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5615 2fea6a4d-a838-0410-917b-93a53c48e9d2