[Dovecot] Dovecot, Shared Mailboxes (via symlink), and ACLs

[Dave]

 >> Now, I have gotten the shared boxes to work IF I changed the permissions
 >> to be rwx for user and group on /home/imapuser/Maildir/*, but this makes
 >> procmail (and .procmailrc) unhappy
 >
 > You'll need to set UNIX permissions in a way that it works.

Thank you for the responses!  OK, it seems from some reading and 
experimentation that procmail will bail very quickly if it doesn't like 
permissions on its user directories and procmailrc files, so what I 
discovered was that I can give EVERYTHING user and group permissions 
under imapuser's Maildir (either rwx or rw depending on context) but 
that still won't let the shared folders work... although that's part of 
it.  Only when I change the permissions of the main imapuser folder 
(/home/imapuser in this example) to 770 will it work.  But, that breaks 
procmail.  As does 760 or apparently giving any write permissions to 
anyone besides the owner.  If I change the permissions to 750, 
everything automagically works.  I can move messages, delete, view, 
etc.  So, I guess that is that!

 > later version, v1.1.10 is getting a bit old). The ACL it mentions isn't
 > Dovecot ACLs, but filesystem ACLs or perhaps SELinux or something else.
 > I guess I should change the error message.

Thanks for letting me know the difference in the ACLs mentioned in the 
error message, that was definitely part of my confusion!!  That put me 
on the path to figuring it out. :)
Dave