[Dovecot] new configure-option --disable-index

[Marten Lehmann]

Hello,

> Either store indexes on a local disk or use nonpersistent memory
> indexes:
> 
> default_mail_env = maildir:/nfs/%d/%u/Maildir:INDEX=MEMORY

my default_mail_env is more complex, so its read from a file by passwd
and userdb. How can I define the default_mail_env (or at least the
index=memory thing) without changing the maildir?

Regards
Marten