No,
you must use unixhierarchysep - otherwise the dot is the delimiter,
meaning that you would have three levels of mailboxes with this (user
-> first -> last).
I don't think you will experience any problems - any server that uses
names with dots has to change this and I think IMAP server and client
explicitly agree about the delimiter sign they use...
Baltasar
----
Cyrus Home Page: http://asg.web.cmu.edu/cyrus
Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu
List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html