[Dovecot] Incompatibility with eudora

[Kadlecsik Jozsi]

Hello,

We installed dovecot-0.99.10.2 on Monday and upgraded to dovecot-0.99.10.4
today, but our eudora users still are very unhappy: old undeleted mail
messages are donwloaded every time they use our server.

Looking into the source code, we found that dovecot knows about the
following status flags:

A:      answered
F:      flagged (?)
T:      draft (?)
R:      seen (read)
D:      deleted

However, it does not know and ignore the O flag. According to IETF
(http://www.ietf.org/internet-drafts/draft-palme-mailext-headers-08.txt)
the following flags are valid (I know, it's a draft and not RFC):

U:      message is not downloaded and not deleted
R:      message is read or downloaded
O:      message is old but not deleted
D:      to be deleted
N:      new

"Combinations of these characters can occur, such as "Status: OR" to
indicate that a message is downloaded but not deleted."

The old mails of our eudora users contain exactly this flag combination:

Status: RO

Could the compatibility problem somehow be fixed? Currently our system is
pretty unusable for the users :-(

Thank you and best regards,
Jozsef
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