On Sun, 2006-04-16 at 20:06 -0400, Jeff Tucker wrote:

Hi, guys.

I'm attempting to transition between Courier IMAP and Dovecot. I may not be able to transition all the courierimapuiddb files instantly or even transition all my servers at the same time. Ideally, it wouldn't matter. Users can login and get to a Courier IMAP machine or a Dovecot machine and read their email (all mounted via NFS).

My question is: is there any reason I can't just do a hard link between courierimapuiddb and dovecot-uidlist? That way, I can transition users over to Dovecot at my leisure. And, if I need to, I can move back to Courier. The hard link is essentially free and lets me make sure these files stay synced.

They don't stay synced, because the first time a new mail arrives in the maildir the uidlist file gets rename()d over and the other uidlist file doesn't get updated. Both Courier and Dovecot does this.

Also I'm not sure if Courier can properly read Dovecot-generated uidlist file because I also write the filename's ":2,flags" part in there.