Author: Timo Neuvonen Date: To: exim-users Subject: Re: [exim] Extremely Simple(?) greylisting with exim?
> Here's a really simple solution to simple greylisting. Define 3 MX > records. Point the lowest and highest to dead IP addresses. Only the
> middle one works. It will delay normal email about 30 seconds to one
> minute when the MTA times out on the lowest MX. Requires no coding at all.
> May work technically, but some (few?) strict TLD domain registries require
that MX records (at least for postmaster etc addresses) have to be fully
functional. And they also run random tests on issued domains. Would result
in a note "you have xx days to fix the system or your domain is subject to
cancellation".
Anyway, this would propably work nice with .com- .net- etc
"no questions asked as long as someone pays" domains...
