RE: Interesting new spam technique - getting a lot more popular.

On Wed, 14 Jun 2006, Church, Chuck wrote:

Since this technique requires a IPinIP or GRE tunnel, wouldn't blocking these two protocols to/from the hosts be sufficient? Assuming of course the customer's host isn't using that normally.

sure, but those are probably just convenience things, what happens when they setup an ssl tunnel? or http tunnel or ping tunnel?