On Thu, 25 Jan 2007, Chris Purves wrote:

Matthew Bickerton wrote:

 I have been thinking about implementing Greylisting. However, I am worried
 about blocking/long delays with e-mails from mail farms (gmail, yahoo etc.)


You could compromise by greylisting based on blocklists (such as spamhaus, etc.).

You could also take care of this by greylisting on the /24 netblock
instead of the /32 address.  Most greylisters support this these days,
and it eliminates retry problems with large mx pools.

Chris St. Pierre
Unix Systems Administrator
Nebraska Wesleyan University
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