Outlook 2000/group returned

Hi,
I have been sending via Outlook 2000 group email to 6 of my friends (TuesdayGang) for over a year now.
Last week they started to be returned saying:

The following message to was undeliverable.
The reason for the problem:
5.1.1 - Bad destination email address ‘invalid domain “”: no dot found’

I can send to them still individually but not as the group, can any body advise please.
I have checked all the addresses, infact they are added to the group via my contacts list.
Thank you.
JRJR
???

The following may answer your question:
http://forums.mozillazine.org/viewtopic.php?t=611694&sid=4e004125aadb84c811a33b9e4d594fc7

thanks bob, but it does not seem to be in there, eeeeeeeeeeeee it seemed simple when I set of on this quest - ha!

Here’s another link that describes your symptoms.
http://www.onlinecomputertips.com/troubleshooting/iefix.html

hi bob, thanks again, downloaded the iefix tool, and it did something? but i think not all, a bit above my knowledge, group email still not functioning, at least trying to fix this is better than gardening in the rain.ha! JR