[vchkpw] How disable non-webmail IMAP access?

[Alessio Cecchi]

I have a server with qmail+vpopmail 5.4.10, courier-imap 4.0.2, 
sqwebmail 5.0.1 and horde.

I need to disable the IMAP access but no the webmail access. In fact if 
i disable IMAP, with horde can't login.

I have seen vmoddomlimits and vmoduser but i'm able only to disable the 
IMAP global.

I can disable webmail access for sqwebmail with:
/home/vpopmail/bin/vmoddomlimits -g w skye.it
and
/home/vpopmail/bin/vmoduser -w skye.it
(what is the difference?)
/home/vpopmail/bin/vmoduser -i skye.it should disable IMAP access but 
not for Webmail, but for me dont'work.

What is wrong?
--
Alessio Cecchi ++ www.skye.it