All my email is forwarded from my runbox.com email accounts to the 8700, everything was fine till about 10 days ago, all of a sudden 1 email does not forward to the BB. Is there some sort of filter i may have accidently activated to stop this email from being forwarded to the bb, or is there something on the bb to block a specific email address?

check the filters for the account on the T-Mobile (if that's your carrier - assuming so since you said it's an 8700g) website

you may have tried setting up a filter to block email from a certaion doamin but set it to block any new mail instead

if not check your forwarding rule

Thanks BERDucky, but , i have no filters set, and my mail doesnt go thru T-Mobile, all is forwared to the BB from my runbox.com email accounts. Its really odd how all gets thru except from my friends email .

I checked the t-mobile filters, and there are none set