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Old 03-23-2011, 07:55 PM   #1
carlosinfl
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Question Sending Email From Mobile Phones


So I have Postfix working great and I've always used webmail if I needed to send email from PC's outside of $mynetworks. So fast forward to today where I got my 1st Android powered mobile phone and I can configure the Android mail client to send/receive IMAP email but my question is do I need to become an open relay to allow my random wireless providers dynamic range of IP's to send mail via Postfix? Seems extremely vulnerable and scary to think I would have to allow my providers IP range to relay mail via my MTA. I started reading a bit and I think I need SASL authentication (correct me please if I'm wrong) and since both Postfix 2.8.1 & Dovecot 2.0.11 are both configured / using TLS, is there anything else I would need or you recommend for sending email from my Android powered mobile?
 
Old 03-24-2011, 02:10 PM   #2
smoker
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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.
 
Old 03-24-2011, 02:14 PM   #3
carlosinfl
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My mobile phone connects to my Postfix server from some random Sprint provided IP and requests to send the message...that has to be allowed in $mynetworks or else it will assume this I.P. is relaying mail. TLS is just encryption and nothing to do with authentication.
 
  


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