[Dovecot] DoveCot compression to save HDD space

[Stephen Warren]

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Bill Landry wrote:
>> 1. save the file to some temporary file in a directory where only
>> deliver has access
>> 2. change effective UID to destination user (keep the deliver group
>> effective) and hardlink the file to the user's maildir
>> 3. change effective UID back to root
>> 4. process next user, goto 2
>> 5. Unlink the temporary file

Permissions are stored in the inode (essentially, with the file itself),
and not in the directory entry. As such, each hard link to the file
would share the exact same permissions, so the above algorithm doesn't
work to give each user their own permissions on the same underlying
storage file.

If you use symlinks, that would work with the above algorithm.
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