Suddenly cannot send Mail

I'm in a tech support loop. Qwest is my ISP, Emerald Webhost is my domain host. My outgoing SMTP server is mail.mydomain.com (at Emerald). Suddenly, a few days ago, I can no longer send mail via Apple Mail from my DSL connection. These two laptops can send using mydomain.com from other connection points (cafe's). The ISP and Webhost tech supporters cannot find any problems, so I turn to this forum.
Internet connection is fine - browsers all work as always.
Incoming mail works as always.
Outgoing mail at my DSL connection returns the "cannot connect on server mail.mydomain.com . . ."
Get Mail before hitting the send button does not help.
Hard reset and reconfigure of the Qwest 2Wire modem did not help.
Same problem on wireless and ethernet at this DSL connection.
I'm using ports 110 and 26, as always.
Both Macs on this DSL connection developed the problem at the same time.
None of the modem or Network or Mail prefs/settings were changed on the Macs.
The laptops send just fine via the mydomain at other connection points (cafe's, libraries).
Reentering passwords in Mail Prefs and at mydomain did not help.
Any ideas?
Thanks
-B

Many ISPs are refusing to pass mail to SMTP servers other than their own - when I am at our place in Laguna Beach I have to use the COX cable SMTP server for all of my outgoing mail - they will not let me connect to any of my POP account SMTP servers - have you tried using the Qwest SMTP server? that may be the answer
Since two Macs started having this problem at the same time that makes it look like a change on Qwest's part
LN

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Using FaceTime http://support.apple.com/kb/ht4319
Troubleshooting FaceTime http://support.apple.com/kb/TS3367
The Complete Guide to FaceTime + iMessage: Setup, Use, and Troubleshooting
http://tinyurl.com/a7odey8
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http://support.apple.com/kb/HT3529
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http://support.apple.com/kb/HT5538
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http://osxdaily.com/2011/10/18/set-up-imessage-on-iphone-ipad-ipod-touch-with-io s-5/
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http://www.quepublishing.com/articles/article.aspx?p=1873027&seqNum=3
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END

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