I don't know that is why I asked?
If Squirrel Mail does use IMAP to create them does that mean that other webmail/IMAP systems would also create them since IMAP is doing the creating?
I am using qmail + vpopmail + courier-imap + squirrelmail on my servers.
I found that the folder names corresponded exactly with the folder names in SquirrelMail. Since SquirrelMail uses IMAP, Im assuming it told courier-imap to make these folders.
-- Aj. Systems Administrator / Developer