[Dovecot] making Dovecot match Courier POP3 UID's

[Jeff Tucker]

Hi, guys.

I've read the information in the Wiki about making dovecot's UID's match
Courier's UID's in the POP3 server, so that a UIDL command on either
server will return the same UID's for the same group of messages.
However, what I've read doesn't match what I'm seeing in Courier.

Courier appears to keep the UID numbers for messages that it uses for
the POP3 server separate from the UID numbers for the IMAP server.
Courier has a file: courierpop3dsizelist which has a line for every
message, like:

1129610881.6075832619.blade4:2,S 2361 1478:1065670602
1129727025.1168007000.blade1:2,S 14718 1479:1065670602
1130005953.3295720403.blade5:2,S 1554 1481:1065670602
1130108068.0849623942.blade5:2,S 8246 1482:1065670602

The first column is the maildir filename, the last column is the UID
that the POP3 server uses and the UID validity. Both are used to create
the UID number returned by UIDL.

The IMAP server uses a completely different UID number that's stored in
courierimapuiddb.

So, it seems to me that dovecot can't ever match Courier's UID numbers
for the POP3 server unless it reads and interprets this
courierpop3dsizelist file.

My Courier-IMAP installation is Courier-IMAP 4.0.6.

Any ideas? This is a real hassle because it means I can't switch the
POP3 server from Courier to Dovecot or, if I do, lots of my users will
download every message again which is just unacceptable.

Thanks
Jeff