[Mimedefang] Greylist Exclusions

[Roland Pope]

Hi,

I have been running a Mimedefang Integrated MySQL variation of greylisting 
now for the past 3-4 months, which has dropped the amount of SPAM we have to 
reject after the DATA phase by 3 quarters!
However, I am getting requests from users who want to have particular sender 
domains excluded from the greylisting.
Does anyone have any ideas as to the best way to go about this?
I know I could do a
sub filter_sender {
    if $sender =~ /\@bypassgreylist.co.nz>?$/i {
        $NO_GREYLISTING_FOR_THIS_MSG = 1;
}

But is there a better way of bypassing greylisting for selected sending 
domains?

Thanks
Roland