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dovecot mysql nfs

Existing

  • Debian Lenny
  • Dovecot querying MySQL (virtual users)
  • Remote NFS server storing Maildirs (owned by vmail, iud 500)

Configuration

Dovecot is able to fetch (through IMAP or POP) Maildirs message if it has:
  • The user's HOME
  • The user's UID
  • The user's GID
For Dovecot:
  • The user's Maildir is the user's HOME appended with "/Maildir"
  • Dovecot executes the message fetching as the user's UID
  • Dovecot executes the message fetching as the user's GID

My troubles

My
 user_query 
returned something like:
home uid gid
/data/mailaka/gulfsat.mg/m/mihamina/ 500 500
I found those lines in my debug logs:
maildir: access(/data/mailaka/gulfsat.mg/m/mihamina//Maildir, rwx):
failed: No such file or directory
maildir: couldn't find root dir
mbox: root exists (/data/mailaka/gulfsat.mg/m/mihamina//mail)
mbox: INBOX: access(/var/mail/mihamina@gulfsat.mg, rw)
failed: No such file or directory
mbox: INBOX: access(/var/spool/mail/mihamina@gulfsat.mg, rw)
failed: No such file or directory
mbox: INBOX defaulted to /data/mailaka/gulfsat.mg/m/mihamina//mail/inbox
Dovecot tried to look for the Maildir structure in
 /data/mailaka/gulfsat.mg/m/mihamina//Maildir 
which doesnt exist on my system.

The solution

I found that my
 user_query 
may return an additional column "mail", sot that the result is:
home mail uid gid
/data/mailaka/gulfsat.mg/m/mihamina/ /data/mailaka/gulfsat.mg/m/mihamina/ 500 500
Dovecot immediately found my messages...

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