ISPs blocking SMTP connections from dynamic IP address space
nicole at daemontech.com
Wed Aug 6 13:19:20 PDT 2003
On 06-Aug-03 Unnamed Administration sources reported Doug Poland said :
> On Wed, Aug 06, 2003 at 11:41:56AM -0700, Nicole wrote:
>> Yes I too have resorted to blocking Ip's with no reverse DNS and
>> its amazing how many big companies can fall into this.
>> As to the Dynamic Space, I also block DSL/dynamicly assigned Ip's
>> as I fall aware of them. (See Example below) Since some Isp's are
>> smart enough to identify their dynamicly allocated space it makes
>> it easy. So far it is extreemly rare for someone to be sending
>> mail directly from these DSL/dynamic spaces that anyone wanted to
> except those of us running FreeBSD SMTP servers from broadband
> connections with valid reverse DNS
Those who do so should be doing one of the following.
a) Since you must be using dedicated IP space, have proper DNS setup.
Pacbell for example will change your reverse DNS for free to match the forward
name you assign to your server. (thus solving two problems at once)
b) Set your server to relay mail via your IP providors server or some other
|\ __ /| (`\
| o_o |__ ) )
- nicole at daemontech.com - Powered by FreeBSD -
" Daemons" will now be known as "spiritual guides"
-Politically Correct UNIX Page
"Witchcraft is in essence the worship of the powers of this world,
beautiful and terrible, but all in a circle under the turning sky
that is the One." -C.A. Burland, "Echoes of Magic"
"Connecting with energy is something humans have to be open
to and talking about and expecting, otherwise the whole human
race can go back to pretending that life is about power over others
and exploiting the planet. If we go back to doing this,
then we won't survive." -James Redfield, "The Celestine Prophecy"
More information about the freebsd-questions