[Full-Disclosure] Re: Spam Solution

["Riad S. Wahby" <rsw@xxxxxxxx>]

Alavan <alavan@xxxxxxxxxxxxxx> wrote:
> It seems to me that if we make all MTA's register somehow (both SMTP and 
> POST), this would eliminate the hijacked machine as spambot phenomenon. We 
> already have MX records for SMTP, but a lot of providers use different 
> machines to receive (via SMTP) and send mail (POST). So, maybe a new DNS 
> record is introduced for POST. Your machine(s) could do both or not. When 
> your server goes to accept a message, it looks to see if the IP of the 
> sending machine is listed in this new DNS record. If not, return a 5XX 
> error.

Uhhh... isn't this just SPF?

-- 
Riad S. Wahby
rsw@xxxxxxxx

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