[Mimedefang] re_match in filter_begin

[Kevin A. McGrail]

> Why don't you simply use both scanners all the time? Performance
> issues? Afraid of false positives?

Solely performance issues.  We scan EVERYTHING for virii but only about 1% 
of email for spam.

> You do have to configure clamav with "PhishingScanURLs no", but I
> believe that issue has been beaten to death here already.

No doubt!  --no-phishing-scan-urls should be added to the default parameters 
for mimedefang for clamscan.  Thanks for the reminder.

Regards,
KAM