list-mailscanner at linguaphone.com
Tue May 27 13:51:55 IST 2008
Its possible but there are still broken email servers out there which
only ever try sending mail to the first mx entry.
Greylisting is still a far better approach. Its also better in that
regular senders get their mail through a lot faster as it is
automatically accepted the first time. If you used the nolisting
approach all email will be delayed until the 1st connection times out.
On Tue, 2008-05-27 at 13:26, Paul Welsh wrote:
> Hi all
> I have read that one way of blocking spam is to use a lowest priority MX
> record that points to a host that doesn't respond to SMTP requests. I've
> seen this idea coined as "nolisting".
> The idea is to block the many spammers who target the lowest priority MX,
> eg, the one with priority 90 rather than 10 as a way of trying to circumvent
> anti-spam measures. If the MX with the lowest priority doesn't respond then
> the spammer doesn't try the higher priority MX but just moves on to the next
> Any thoughts on this idea?
> Personally, I can see how it would block a percentage of spam but whether
> that percentage is high enough to make it a worthwhile idea is open to
> Message sent using UebiMiau 2.7.9
More information about the MailScanner