Tried everything but cannot get Mail to send on one account

I know this is a wide reaching subject and I've been trawling all the web for a solution for past 48hrs and have tried everything but still cant get mail to send or connect to SMTP server for one set of accounts!!!
I am running Lion on iMac and it's fully up to date. I am using Mail for iCloud a/c, some hotmail a/c's and a Company domain with various email accounts, this is the problem one. I cannot for the life of me get the Comapny accounts to send mail, the same accounts are on iPad and Iphone and working fine but on Mail - no chance. I have:
deleted accounts and set up again
tried POP and IMAP
Tried different ports
tried different securitity levels
Deleted .plist file
Removed passwords from keychain
deleted all assocoiated Mail files to create "fresh" app
repaired disk permissions
Deleted again and reset again - over and over
Used a friends MBP and accounts worked fine!!
What is going on? I shut iMac down as I was on holiday for 2 weeks, when I got home booted up and thats when the issues started, nothing changed at all in terms of iMac settings, internet etc etc. VERY WEIRD! Especially as seems fine on iPhone & iPad.
Would appreciate any help but please note I have tried all the basic type repairs as listed.

Hi Glenn's
I am in the UK and had a similar problem. Ii eventually found the problem was due to my BT Home Hub Router. Not sure where you live, but of you are in the UK, this might work for you.
I found this fix below on https://discussions.apple.com/thread/4604180?start=15&tstart=0
It worked for me. If you can't link to the URL, here is the body of the text
There's an issue related to the BT homehub that is providing a hostname that is "syntactically incorrect" for several smtp server.
Here's how you can fix it.
Using your internet browser, go to the address "192.168.1.254
- Follow instructions to reset your password if asked.
- Then go to "Settings", then "Advanced Settings" and "home network"
You will see there all the devices that are connected or that has been connected before. It's gonna be easyer if yout computer is the only one connected.
Your computer should have a name like "unknown-xx:xx:xx:xx:xx ...
Click on this name, chose another name without any special characters, like "macbook" for exemple.
And then click on "apply"
- restart your computer.
That should fix the issue.
Credit goes to vincentfromcork for providing me with the solution.
Hope it works for you. If it does, spread the word ;-)

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