[Bug 716654] [NEW] latest ubuntu updates killed mail delivery

[jan]

Public bug reported:

Binary package hint: postfix

The latest Ubuntu patches (including a dovecot update) on feb 8, 2011 caused my mail delivery to stop working.
The logging filled with messages like

dovecot: deliver(uuu): file_dotlock_create(/var/mail/uuu) failed: Permission denied (euid=1000(uuu) egid=1000(uuu) missing +w perm: /var/mail) (set mail_privileged_group=mail)
dovecot: deliver(uuu): msgid=<....>: save failed to INBOX: Internal error occurred. Refer to server log for more inform

It turns out that locking is NOT available with the deliver option
http://wiki.dovecot.org/MailLocation/Mbox#Locking
and that the update caused two lines to be appended to /etc/postfix/main.cf

Fortunately, I had this file under RCS, so that I could catch this.
RCS file: RCS/main.cf,v
retrieving revision 1.3
diff -r1.3 main.cf
59a60,61
> home_mailbox = Maildir/
> mailbox_command = /usr/lib/dovecot/deliver -c /etc/dovecot/conf.d/01-dovecot-postfix.conf -n -m "${EXTENSION}"

How can I make sure that coming upgrades don't get my mail stopped again ?
Note that I need to have the files in /var/mail, because of another bug:

https://bugs.launchpad.net/bugs/694493

** Affects: postfix (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/716654

Title:
  latest ubuntu updates killed mail delivery