How is it possible that Domino add the domain name at the end of the group name in a mail.It’s to resolve mail problem beetween different domain :
If domainA send a mail to domainB with a group from domainA in the field To, and a receiver from domainB make a reply to all, his client and serveur don’t know the group.
If the domain is populate, with the adjacent domain document, there is no problem.
Of course, the domainB hasn’t a copy of address book from domainA.