sender whitelist implementation

[ML]

Hi,

I wonder how to bypass a dspam filter for some sender only (aka a  
filter whitelist), the issue is that i'm using a double filtering  
system :

#main.cf
smtpd_recipient_restrictions =
        ...
        reject_unauth_destination,
        ...
        check_recipient_access hash:/usr/local/etc/postfix/ 
antivirus.mygen,
        ...
        permit

#antyvirus.mygen, one line per recip that need antivirus check
[EMAIL PROTECTED]  FILTER scan:127.0.0.1:10026

#master.cf

scan      unix  -       -       n       -       16      smtp
        -o smtp_send_xforward_command=yes
127.0.0.1:10025 inet n  -       n       -       16      smtpd
        -o content_filter=
        -o  
receive_override_options 
=no_unknown_recipient_checks,no_header_body_checks,no_address_mappings
        -o smtpd_helo_restrictions=
        -o smtpd_client_restrictions=
        -o smtpd_sender_restrictions=
        -o smtpd_recipient_restrictions=permit_mynetworks,reject
        -o mynetworks_style=host
        -o smtpd_authorized_xforward_hosts=127.0.0.0/8
127.0.0.1:10028 inet n  -       n       -       16      smtpd
        -o content_filter=dspam:unix:/var/run/dspam.sock
        -o  
receive_override_options 
=no_unknown_recipient_checks,no_header_body_checks,no_address_mappings
        -o smtpd_helo_restrictions=
        -o smtpd_client_restrictions=
        -o smtpd_sender_restrictions=
        -o smtpd_recipient_restrictions=permit_mynetworks,reject
        -o mynetworks_style=host
        -o smtpd_authorized_xforward_hosts=127.0.0.0/8
dspam      unix  -       -       n       -       5      lmtp
        -o lmtp_send_xforward_command=yes

the antivirus filter (clamsmtpd) send back to 127.0.0.1:10028 using  
smtp, postfix send to dspam using LMTP, and dspam send back to postfix  
for delivery using SMTP again on 10025

now how to bypass dspam for some *senders* ?

i planned to use an option on 127.0.0.1:10028 this way :
-o smtpd_sender_restrictions=check_sender_access hash:/usr/local/etc/ 
postfix/dspam_whitelist
where dspam_whitelist would contain a fake filter :
[EMAIL PROTECTED]   FILTER scan:[127.0.0.1]:10025

but of course this doesn't work because spaces are not allowed after - 
o smtpd_sender_restrictions= (fatal: unexpected command-line argument:  
hash:/usr/local/etc/postfix/dspam_whitelist)

so, how to achieve this ?

thanks in advance for any tips

Regards,
David.