IMAP - fetch using imaplib

[Asle Pedersen]

I have adressed this question to the group previoussly without any success
so I try once more :
I need help with the following IMAP command:
DF56 FETCH 1:3 (RFC822.SIZE BODY[HEADER.FIELDS (FROM SUBJECT)]).
I have tried using the imaplib for other fetch commands without trouble, but
this one I can't seem to get working utilising the imaplib.

-Asle Pedersen