The User member of a message is not needed anymore.
The from that is send to the server, should always be the "system" from. This is also called the Bounce address http://en.wikipedia.org/wiki/Bounce_address
The SendMail function is rewritten and has the following new functionality:
- It is optional to skip verification of keys. The config option SKIP_VERIFY is added
- If the port is 465, or ending on 465, the TLS(/SSL) connection is started first.
A new struct is created named EmailAddress that contains alternative
email addresses for users. Also the email related methods; IsEmailUsed
and GetUserByEmail are updated.
DeleteUser deletes the extra email addresses and DeleteInactivateUsers
also deletes inactive accounts. This could be factored out, but should
do it for now.