Send mail Comcast

Sudddenly I cannot send mail through Apple Mail using Comcast account on either iMac or Macbook Pro using 10.8.3.  Oddly, neither iPhone or iPad is affected.  Incoming is fine, but I get the message that mail cannot connect to server when attempting to send message.  Connection doctor gives green light to all connections.  I have done soft and hard resets of modem and router, cleaned caches, and repaired permissions.  I have gone through the scripted Comcast routine with 3 different foreign Comcast agents.  We can find no problem with settings and have tried numerous ports with no success.  Does anyone have any other suggestions?

Wow. That sounds frustrating. You sound like you have already tried just about everything. Probably I don't have to tell you that it is likely the Comcast people you worked with are not very expert with macs.
If this were happening to me I would be trying things like: recreate the mail account from scratch, and experiment with the SMTP ports.  Out of sheer desperation, I would even go so far as to reset the PRAM/NVRAM and reset the SMC.  To help rule out bizarre third party software conflicts, I would try from a different mac user account (i.e., create a new user account on your computer via System Preferences, Users & Groups - not with comcast), and I would try it in Safe Mode (hold shift while starting up).
About NVRAM and PRAM
Resetting the System Management Controller
starting up in Safe Mode
Mail: Troubleshooting sending & receiving email messages (OS X ...

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