It's not an open relay. An open relay is where the mail server does not restrict or authenticate those who use it. Doing it by ip address would be difficult anyway unless you are the only one using it. You can pop from anywhere or use imap with most mail services. Authentication is carried out and the server checks to see if it can relay for that domain. As long as both check out, you carry on as normal. Using TLS or other such security is just a more secure authentication method.
The very basic restriction was pop before send to make sure you were already authenticated.
Google requires TLS, so I would have thought Android should support it.
Last edited by smoker; 03-24-2011 at 02:15 PM.
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