sean finney on 1 Apr 2009 06:02:10 -0700

[Date Prev] [Date Next] [Thread Prev] [Thread Next] [Date Index] [Thread Index]

Re: [PLUG] OT: spammer's DNS


On Wed, Apr 01, 2009 at 08:40:16AM -0400, Art Alexion wrote:
> Real mail stopped going to the old server in about 48 hours, but spam still 
> goes there.  Can anyone help explain how the DNS servers that spammers use 
> differ, and why this happens?

spam servers (and infected zombies) are usually the least standards-complaint
systems out there, so i wouldn't think about it too hard.  maybe they have a
poor implementation of DNS caching, or maybe it's intentionally designed that

thankfully, such non-compliance is also what gave birth to greylisting
and other effective anti-spam techniques :)


Attachment: signature.asc
Description: Digital signature

Philadelphia Linux Users Group         --
Announcements -
General Discussion  --