[Dshield] DNS MX record block question

Kenneth Porter shiva at sewingwitch.com
Fri Sep 5 22:49:17 GMT 2003

--On Friday, September 05, 2003 3:39 PM -0700 Richard Roy 
<RoyR at justicetrax.com> wrote:

>  I said that one should absolutely
> block when the domain does not have a valid MX record because if you are
> not a valid mail server, then why are you sending me mail?

Common misconception. Mail servers can send or receive, and it's common for 
larger operations (eg. ISP's) to put those functions on separate hosts. 
Only the receiver needs an MX record.

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