What I do is sort of partial greylisting. If a connection is suspicious
I give them a temp error on my lowest MX but accept them on higher MX
records. So that way most MTA will try a higher MX right away and it
doesn't add much of a delay.
François Rousseau wrote:
Greylisting is not always good...
The greylisting insert delay in delevery and sometimes the email have
to be delever fast.
For example: on some public wireless network, you have to register to
have access to the internet. You can access internet without
authentification for 15 minutes. In this 15 minutes, you have to
register in the captive portal and then go confirm your inscription by
clicking in a link received by email. If the greylisting insert more
then 15 minutes of delay...
I think technologies like SPF have a better futur.
François Rousseau
