When attempting to file carbon copies of outgoing mail into mailboxes which are actually MH mailboxes accessed via IMAP, Pine reports: Folder "outgoing" doesn't exist. Create? This isn't true - not only is the 'outgoing' folder present but the same version of Pine can happily save the message to it if it's Bcc'd to myself and subsequently moved from my inbox. This is probably a bug in the imapd (also from RH6.2) but I'm reporting it against pine because previous versions of pine do work correctly. The version shipped with RH5.2, for example, was fine.
Reproduced. Will look into it later.
This seems to be fixed in pine-4.21-21