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smtp settings correct; outgoing email still not working

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Every time I change providers, I have problems with my SMTP settings. I moved, had to change to AT&T. I got the recommended settings from AT&T, entered them for both incoming (POP) and outgoing (smtp.att.yahoo.com); port for incoming: 955; port for outgoing: 465; Connection security: SSL/TLS; authentication: no authentication & password (neither work). I called AT&T and they said everything is set correctly. I can RECEIVE messages, but can't SEND them. If I use AT&T's e-mail to send messages, it works - but T-bird still doesn't work. What am I missing?

Every time I change providers, I have problems with my SMTP settings. I moved, had to change to AT&T. I got the recommended settings from AT&T, entered them for both incoming (POP) and outgoing (smtp.att.yahoo.com); port for incoming: 955; port for outgoing: 465; Connection security: SSL/TLS; authentication: no authentication & password (neither work). I called AT&T and they said everything is set correctly. I can RECEIVE messages, but can't SEND them. If I use AT&T's e-mail to send messages, it works - but T-bird still doesn't work. What am I missing?

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looking at at&t site I see inbound and outbound in addressing att.net

att.net inbound.att.net / 995 outbound.att.net / 465 (POP3)

This page shows settings

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It's correct for att.com, but not for ATT U-verse.

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Try outgoing server ports 587, 25, 2525