bug: incorrect conversion from MMDF to mbox

[William Lovas <wlovas@xxxxxxxxxxxxxxxx>]

Hi,

I tried submitting this bug from two different systems and got relay
errors, so i thought i'd try the developers' list.

I've encountered a bug in mutt versions 1.4i and 1.5.6i: if you load an
MMDF mailbox with no "From ..." lines and try to save the messages to an
mbox mailbox -- i.e. with mbox_type=mbox -- mutt will create invalid mbox
mailboxes by not inserting any "From ..." lines.

The problem is very easy to reproduce: simply load an MMDF mailbox without
"From ..." lines, set mbox_type to "mbox", and save a message from the MMDF
mailbox to a new mailbox.  Then if you try saving another message to the
just-created mbox mailbox, you'll get "... is not a mailbox".

Pine seems to handle this case correctly.

cheers,
William