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Public folders in dovecot can be configured a few different ways. The easiest way is to simply use symlinks. A dot prefixed symbolic link to external directories will be properly resolved by Dovecot and will be presented to the user as a standard mailbox. When setting up such a public share, it is important to note that Dovecot operates within the user context. Thus each user who is granted access to the public folder via symlinks must also have the appropriate file system permissions, designated via either standard POSIX or ACL management. To set up a shared folder in this manner, you can run the following commands:
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## cd into the mail store so we can use relative paths cd /var/spool/imap/dovecot/mail ## create our shared folder and mailbox mkdir p Shared/.MySharedFolder ## setup POSIX and ACL privileges on the mailmox for our users chgrp R staff Shared/.MySharedFolder chmod R g+rwx Shared/.MySharedFolder chmod +a "staff allow list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,readextattr, writeextattr,readsecurity,file_inherit,directory_inherit" Shared/.MySharedFolder ## ## cd ln create our symlinks for our users. We first cd into our user s folder so that we can use relative paths on our links C3C4E3BB-1FE8-4A6E-B445-5474CC4E3223 s ../Shared/.MySharedFolder .MySharedFolder
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NOTE: The ../ portion of the above path references the parent directory. Thus, inside of user jdoe s email folder, we are creating a link to the Shared folder in the parent folder. Using a relative symlink like this allows us to move the entire mail store to a different directory or volume without the paths breaking. At this point, user jdoe will have full access to the mailbox MySharedFolder. We could then symlink the same directory to another user, say janedoe. The beauty of file-systemlevel permissioning here is that you can do all kinds of cool stuff with ACLs. For instance, you could prevent janedoe from deleting items, leaving her only with the ability to add new items to the store.
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With the introduction of Dovecot in 10.6, backing up mail got quite a bit easier. In 10.5, the cyrus database risked potential for corruption when backed up live. Though this was far less of an issue than with earlier versions of OS X, the reality was that it was still recommended to take the system offline to back it up. No longer! Now, mail can be backed up by your standard backup program, be it Netvault, TiNa, or rsync, or even Time Machine. Because each message is stored as its own file system entity, granular message-level or mailbox-level restores are possible.
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To perform a restore, just replace the appropriate e-mails or directories into the user s mail root. You can restore entire mailboxes simply by placing the respective dot-prefixed folder there or: alternatively, you can create your own restore mailbox, using the following command (here we use jdoe in the mail paths for brevity, it is necessary to use the user s GeneratedUID, as discussed above):
## create the new Mailbox Restored, and it s cur subdirectory, which holds the mail files mkdir -p /var/spool/imap/dovecot/mail/jdoe/.Restored/cur ## copy our backed up email files into our restore mailbox s cur/ directory. rsync avu /path/to/my/backupemaildir/ /var/spool/imap/dovecot/mail/jdoe/.Restored/cur/ ## make sure the new user is the owner chown R jdoe /var/spool/imap/dovecot/mail/jdoe/.Restored ## Delete our index file, forcing them to be rebuilt rm /var/spool/imap/dovecot/mail/jdoe/.Restored/dovecot.index*
You can also copy individual e-mail messages into pre-existing mailboxes without much fanfare, though it is once again recommended that you remove the index file. There are other notable mail-related configurations and database files that you may want to backup, though it s not strictly required: /var/amavis: Contains filtering information, including the SpamAssassin Bayes database (all learned junkmail) /var/clamav: Contains the latest virus definitions /etc/freshclam.conf: ClamAv configuration file /etc/amavisd.conf: Amavisd configuration file. /etc/mail/spamassassin: SpamAssassin configuration files. If you are running a 10.5-based mail server, it is recommended to backup its Cyrus database without the service running. An excellent tool named mailbfr can be found at http://osx.topicdesk.com. It is a free utility and manages the backups of the 10.5 database, including stopping and starting the services as necessary.
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