You'd think some spammers would get wise to using hostnames like "ns1.xyz.com" for sending spam -- you really don't see much, if any of this sort of thing, Rianto?From spammer point of view, using static IP and setting up Reverse DNS is *definitely not a wise move *!!
Setting up Reverse DNS take more than 2 weeks if you want to own an IP address range. You have to contact APNIC/ARIN/RIPE etc to get IP address allocation, pay them fees .. consider the routing etc .. delegate name server .. etc ..
If you want to setup Reverse DNS from ISP / Webhosting company, you have to have static IP address and you have to ask the admin of the the name server of which the IP address delegated to create new entry. This may take 1 day, but then their IP address may get blacklisted within minutes / hours of spamming. It will also be much easier for law enforcement agent to catch spammer if they operate this way.
Anyway, I've seen a lot of spam coming from ns1.%, mail.%, etc but most of them run a real mail server. They retry after getting 4xx rejection and there is nothing greylist can do about that.
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