Email sends on one but not the other laptop

I have both a MBP and a MB with the same work email address set up identically on both. Both have been used to send and receive email with no problem until last night. Suddenly I cannot send email on the MB.
Here's details:
I'm using my work email - for here let's call it "[email protected]". This email is set up with it's incoming server as mail.xyz.net and outgoing server as smtp.comcast.net. The selected port is 110.
So I can send and receive all the emails I like on my MBP using the above settings. The MBP is running Mail 5.1. One the MB, when I send any email using the exact same settings, preferences, everything - I get an error message saying the server - smtp.comcast.net has rejected the sender address of "[email protected]"
I checked the "Connection Doctor" in Mail 4.5 and it says "[email protected] is connected and logged in" to the server. But soon as I send an email, BAM, the address is rejected?
I talked with Comcast and they confirm their server is fine, IT IS NOT REJECTING my sender address "[email protected]" and they have no clue what's going on.
Nor do I and before I pay APPLE $50 for support I thought I'd try here.
Any ideas???
Thanks

Try changing the port to 995. I have no idea why that works but it helped when I had the same problem.

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