What is the AT&T smtp server for? The SSL is set to "off"

I was looking around at my Mail settings on my iPhone and noticed there's an AT&T smtp server window. You access it my Settings/Mail Contacts Cal/one of your email accounts/SMTP server/. At the top is the smtp server for your email address which is on, and below are smtp server panes for your other email accounts which are set to off. But one of those smtp server panes is for the AT&T smtp. For what function is it used for? It's vreyed out but SSL set to OFF for the AT&T smtp and the Yahoo smtp, but all the other smtp's are set to ON for SSL.
Isn't it better for the Secure Sockets Layer (SSL) to be on? Why is Yahoo's and AT&T's set to OFF. I can't find where to access a non-greyed out AT&T's smtp window pane.

Allan Sampson wrote:
when sending/receiving via AT&T's cellular network, all data is encrypted over the network, which is a GSM standard.
Note that in the USA a weaker version of the GSM encryption is used than in Europe.
http://www.gsm-security.net/faq/gsm-encryption-algorithm-a5-cipher.shtml
Also, the GSM encryption has been broken a long time ago, but someone whould have to sit between the phone and the basestation to capture and decode the traffic (or they must have access to the network operator's, so called, Legal Intercept interface).
http://www.gsm-security.net/faq/gsm-a5-broken-security.shtml
And, AFAIK, the GSM encryption is only in use on the wireless connection between the device and the basestation it is connected to (not on the operator's backbone network, and not when the traffic exits the operator's network and goes to the Internet outside, which it must, in order to get to SMTP servers not in the operator's machine rooms).
And a last point: Even if you use SSL/TLS between the client and the SMTP server, it is not necessarily used from the SMTP server to the receiving email server (which might mean that the message travels through tens of systems unencrypted until it reaches its destination).

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