[Mimedefang] Pre-Emptive Greylist entries

[Roland Pope]

Hi all,

I have implemented a fiddled version of John Kirkland's MySQL MD-Greylist 
code (Thanks to Gary Funk for sending me the code), which is reducing SPAM, 
but producing complaints from users that some important customer emails are 
being delayed.

One idea I had was to try and create a whitelist entry in the database for 
emails sent from within my network to customers, to try and reduce delays 
for initial replies from said customers.

Ie. When one of my users sends an  email from user at mynet.com to 
customer at custnet.com, I lookup custnet.com in DNS, get the IP's of the 
highest priority MX's and create a whitelist entry so that it decreases the 
chance that a reply from customer at custnet.com to user at mynet.com. gets 
delayed by the greylist code.

What do you think about this idea? Does anyone have any suggestions for 
improvements?

Thanks
Roland