On Sat, 2009-02-07 at 12:29, Aiko Barz wrote: > On Fri, Feb 06, 2009 at 10:42:39AM +0100, Chris Thompson wrote: > > I run two mail and web servers from my house on a DSL line. Until a few > > weeks ago I was on cable but a new ISP launched some good SME offers and I > > decided to make the switch. > And I drop all connections to port 25 from IP addresses, that have a > reverse DNS entry like dsl.foo.bar, dynamic.foo.bar, dhcp.foo.bar. > There is a 99.999% chance, that a botnet is talking to you.
Which is totally wrong. A lot of legitimate SMTP servers are on such IP addresses. A lot of (so called) admins today don't understand Robustness Principle (rephrased): Be liberal in what you accept, and conservative in what you send -- Kind regards, Milan -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
