I have been having the following issue. A internal GW users sends an email to a external non-groupwise user and cc's other internal groupwise users. The external non-groupwise user replies to the email, then receives several bounce messages because some of the users do not exist. When looking at the header I see that some of the internal users email address are in the userid.po.dom format, while others are in the userid.domain format. It has only been happening for the past couple of months. What have I changed to create this issue? Thanks. David