Greylisting and whitelisting SMTP client domains

Hi,

I'm using Postfix (2.2.3) with greylisting. In the greylisting doc
(http://www.postfix.org/SMTPD_POLICY_....html#greylist) I read how to
whitelist the sender domain by puting the domain name in
/etc/postfix/sender_access (e.g. "securityfocus.com OK"). But I also
have some email forwarding from other domains and then the sender domain
is not useful. Instead I would like to whitelist the SMTP client domain,
how do I do that?

I tried to add "thedomain.com OK" to the file
/etc/postfix/antispam/client-ok and used
smtpd_client_restrictions =
hash:/etc/postfix/antispam/client-ok
but it didn't work.

Best regards,
Jan