[Dovecot] Access filesystem (NFS) as some user

[Mihamina Rakotomandimby]

> Mihamina Rakotomandimby <mihamina at gulfsat.mg> :
> My Dovecot server has to access the users Maildirs.
> Maildirs are on a NFS mount that only a user (vmail/500) may read
> and write. No one else.

My user_query returns:
+--------------------------------------+-----+-----+
| home                                 | uid | gid |
+--------------------------------------+-----+-----+
| /data/mailaka/gulfsat.mg/m/mihamina/ | 500 | 500 | 
+--------------------------------------+-----+-----+

So, I expect Dovecot to be vmail/500 when accessing the home, but the
error (syslog):

May 4 16:55:04 hostname dovecot:
  stat(/data/mailaka/gulfsat.mg/m/mihamina/) 
  failed: Permission denied

/data/mailaka/gulfsat.mg/m/mihamina/ is on a NFS mount:

 192.168.1.69:/data/mail on /data/mailaka type nfs

>Is the workaround of changing dovecot's system UID/GID a not-so-bad
>one? (I am trying to see if it works, at least...)

Bad. Gave up.

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