ISPs blocking SMTP connections from dynamic IP address space

Doug Poland doug at
Wed Aug 6 11:48:05 PDT 2003

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
>  recieve. 
except those of us running FreeBSD SMTP servers from broadband
connections with valid reverse DNS


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