Many thanks for the response and it was quick too - I like quick responses!
I guess I will need to patch in a call to my ISP but in the mean time under SMTP diagnostics from the website you gave I got this:
That's a good sign yes? Saying that my SMTP relay agent is not an open relay meaning that it only relays information for my domain! ...theoretically speaking anyway!
250 NetraT1-DNS2.optiplex-networks.c [141 ms]
MAIL FROM: <email@example.com>
250 2.1.0 [219 ms]
RCPT TO: <firstname.lastname@example.org>
554 5.7.1 <email@example.com>: Relay access deni [234 ms]
221 2.0.0 B [141 ms]
The GEO code was not available either for my IP address and I'm guessing it's either my ISP or the fact that I'm behind a reverse HTTP proxy??
Uh budget network solutions SUCK! big time.