J.D. Falk wrote:
On Aug 1, Geoff White <geoffw@precipice.v-site.net> wrote:
Let this be an object lesson to those of you out there who have yet to upgrade: the spammers will find you sooner or later.
And once they've found you, they will keep on relaying through you until you make it impossible for them to do so.
Believe it folks! These characters are persistent and once one finds you the rest follow.
Can anyone elaborate a little more on the "one true" set of procedures that one should take to prevent spammers from abusing ones resources.
It varies depending on what your situation is, and how smart you expect your customers to be.
The current problem that I have is valid customers who are "on the road" and want to sendmail through my SMTP server when they dial into att or netcom, before their eudora's used to point their SMTP server at me, that ain't happenin' after my spam attach so is there some work around that they can use?
The /best/ idea is to have them use a local SMTP server. If they can't or won't do that, there are a few recipes floating around that let you exempt messages from specific sources; I haven't investigated those much, but they're out there.
If someone had a fixed IP address I could theoretically allow that one through my router filters but that's just begging for IP spoofing.
********************************************************* J.D. Falk voice: +1-415-482-2840 Supervisor, Network Operations fax: +1-415-482-2844 PRIORI NETWORKS, INC. http://www.priori.net See us at ISPCON '97, booth #501 "The People You Know. The People You Trust." *********************************************************