Why does dovecot mount the user home directory whenever the user checks his email (either pop or imap)?

Is there a way to disable this?

I have indicated in the default_mail_env = mbox:/home/%u/:INBOX=/mail/%u:INDEX=MEMORY.

The users are in ldap. Windows users' home is in /home/%u so this is ok but unix users' home are in their local computers and are mounted (via automount) at /d1-data/pcname/username.

Even if mounted, the users' home directory isn't used by dovecot since nothing gets written to it. The users only checks his pop mail but still, his home directory gets mounted.

Is it possible that dovecot won't try to mount the user's home directory whenever the user checks his mail?

Thanks a lot.

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