IPhone message. "Cannot Send Mail"  "The connection to the outgoing server.

It states:
"Cannot Send Mail" "The connection to the outgoing server "(null)" failed."
This is the error I get attempting to send Yahoo mail using EDGE network on at&t.
I would guess that only 2-3 emails out of every 10 go through. The rest get the above error message.
Please help if you can.
Thanks

Well, if your on ATT Yahoo. The settings are as follows, and I've had luck both sending and recieving with these settings.
Incoming Mail Server
Host Name: pop.att.yahoo.com
User Name: *****@sbcglobal.net (or whatever your ATT domain might be)
Password: Required
Outgoing Mail Server
Host Name: smtp.att.yahoo.com
User Name: ****@sbcglobal.net (or whatever your domain happens to be)
Password: Optional (I left mine blank)
Under Advanced
Deleted Messages: Remove After ? (Your Choice)
Incoming Settings
Use SSL : On
Authentication: Password
Delete from Server: Your choice
Server Port: 995
Outgoing Settings
Use SSL: On
Authentication: Password
Server Port: 465
I've taken these setting from my phone. I can't remember all the domain names for the ATT Yahoo, but I know sbcglobal is one, and I believe attglobal is another. Also to change the ports under advanced, though you shouldn't have to, simply click the port area and a keypad will come up below. You can type the port number there.

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