On Tuesday, January 10, 2006 2:49 PM +1300 Roland Pope
<[EMAIL PROTECTED]> wrote:
Ie. When one of my users sends an email from [EMAIL PROTECTED] to
[EMAIL PROTECTED], 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 [EMAIL PROTECTED] to [EMAIL PROTECTED] gets
delayed by the greylist code.
There's no guarantee that a domain's MX is the same addressed used for
outbound mail. The larger the domain, the less likely that will be true,
esp. if mail is outsourced to an ISP or a hosting provider.
Another approach is to use a wildcard greylist entry that ignores the IP
address but causes the system to record the actual IP when a new message is
seen.
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