Re: Doug attack scenarios without SPF

On Sun, 19 Nov 2006, Markus Stumpf wrote:

> while I agree that there is some potential for a attack I don't see
> it as a really big problem.

I agree.

> 4) It is easy for the MTA to check for the length of the EHLO argument
>    and ensure that it fits in one UDP packet

The SMTP server should not try to resolve the EHLO/HELO argument.  
There is nothing to learn from by resolving this argument.  It just adds
to the DNS load, and it increases the time to handle a signle message.
This then reduces the rate at which the mail server can process
messages, and increases the resources consumed by the email server.  
(gun-foot-fire-aim)


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