Plese click your earlier thread as resolved so that we are not running incircles here.
The only reasons mail is 'bounced' is the intended recipi ent asddress is supended or no longer used. or as is more likely in your case
The address is incorrect/corrupt in some way.
Carefully examine each affected address and ensure that no extra characters have been aquired or dropped. Some client/addressbooks [Thunderbird for an example] can add a < or > at the biginning or end of an address and if that has happened it will bounce The time to check is when it is in the address line of the mail and ready to go
Re consdiering this. If it is the case that the friend concerned are all NTL based , does this infer that other mails you send to other ISP's based contacts are goimg through? If so then I suggest also that something at NTL has indded changed. Contact your freids by telephone and aske then to send you a mail amd marked current address. Then add this to your address book and delete all previous.
I also have a few people who send me emails on my NTL email address which I don't get. (mainly it seems, always from AOL)
I have a Hotmail email address and my own domain email address. Both the Hotmail and Domain email addresses have been setup to receive any email sent to my NTL address.
So, generally, I get the same email 3 times but in the case of someone who sends to my NTL address only I do get it on Hotmail. For example if anyone responds to a thread I have started I normally get 3 notifications of any response.