Re: Which Spam Block List to use for a network?
On Tue, 22 Jun 2004 18:41, Adam Funk <email@example.com> wrote:
> On Tuesday 22 June 2004 09:11, Russell Coker wrote:
> > A user has no business making direct connections to mail servers.
> Maybe in your area you can get a residential ISP whose mailrouters are
> always reliable. Where I live there is one cable modem provider with
> no competition; its mailrouters usually work but do not always warn you
> in good time that mail is queued.
So find someone else who can relay mail for you. In the past when such things
have been discussed people have made offers of a free mail relay service for
> This is a smarter way to do it. Wouldn't you admit that the problem is
> not from MTAs on dynamic IP addresses, but rather from infected Windows
> machines on dynamic IP addresses?
MTAs on dynamic addresses is an entirely different problem. At one ISP I
worked for we had a problem of people installing mail servers on their PCs as
open relays. It was decided not to block port 25 inbound, so I planned a
scheme where the outbound mail relay would attempt a port 25 connection to
the workstation before accepting mail from it. If the port 25 connection
succeeded then the mail would be rejected...
http://www.coker.com.au/selinux/ My NSA Security Enhanced Linux packages
http://www.coker.com.au/bonnie++/ Bonnie++ hard drive benchmark
http://www.coker.com.au/postal/ Postal SMTP/POP benchmark
http://www.coker.com.au/~russell/ My home page