[Dovecot] Override quota rules based on mail's content

[Marty Anstey]

Actually I just tried this and it doesn't appear to work:

Fatal: Error in config file /etc/dovecot-noquota.conf: deliver doesn't
support !include directive

I checked deliver.c in both 1.1.8 and 1.2.4 and it doesn't look like
it's supported in either.

> well, you could also do:
>
> /etc/dovecot-noquota.conf:
>
> !include /etc/dovecot.conf
> mail_plugins = 
>
> With v1.2+ you could do it a bit more cleanly by overriding quota
> instead of mail_plugins:
>
> plugin {
>   quota = maildir:User quota:noenforcing
> }
>
>