Jennifer Gavin-Wear wrote:
> SPF does help in scoring spam, I use it myself and it works alongside other
> anti spam measures just fine.
> 
> I'm not sure why you are talking about DHCP addresses as these are only used
> on an internal network and not across the internet.

DHCP, or a tunneled variant like IPCP, is commonly used by ISPs 
to assign IP adresses to their customers.


> DHCP addresses are
> issued on request from an address pool by a DHCP server, typically on the
> Class A, B, C reserved IP ranges (10.x.x.x, 172.16.x.x and 192.168.1.x).

The ranges reserved for private assignment are are actuall 10/8, 
172.16/12 and 192.168/16 (see RFC 1918).


> In situations where your IP address will vary because you are getting it
> from a DHCP pool then it's impossible to do any authentication against the
> IP address unless you allow/block the whole DHCP range.

Or control the DHCP server :)

Jochem

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