iptables: drop or reject?

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To drop or not to drop, that is the question. If there's a server out there sending spam e-mail, and I use iptables to block it, is it best to simply drop the packet, or should I do a '--reject-with icmp-host-unreachable' (or 'icmp-port-unreachable') or just a 'tcp-reset'?

Basically, if I just drop the packet, the server in question would simply continue to send stuff, wouldn't it? As far as it knows, its spam reached the destination, whereas if I send something back, it might actually acknowledge and stop? Yes? No?

--
W | It's not a bug - it's an undocumented feature.
 +--------------------------------------------------------------------
 Ashley M. Kirchner <mailto:ashley@xxxxxxxxxx>   .   303.442.6410 x130
 IT Director / SysAdmin / Websmith             .     800.441.3873 x130
 Photo Craft Imaging                       .     3550 Arapahoe Ave. #6
http://www.pcraft.com ..... . . . Boulder, CO 80303, U.S.A.

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