======VPOP3.SendMessage=====
The [[lua_scripting|Lua]] function 'VPOP3.SendMessage' sends a text email message

It takes four parameters:
  - The email address of the sender
  - The email address of the recipient
  - The subject line
  - The message body

The function returns one value:
  - boolean - 'true' if the message was sent

Note that this function can only send plain text emails, not HTML messages