Re: [Asrg] 3. Proof-of-work analysis

"Hallam-Baker, Phillip" <pbaker@verisign.com> wrote:

>> > Or for that matter just don't respond with a 250 to their HELO for N
>> > seconds and if they continue talking anyhow drop the connection
>> > (something like this is in the current beta sendmail, 8.13.0beta.)
>> 
>> That works currently against spamware that pipelines illegally.  If it
>> becomes more common, that spamware will become less common.
>
> Problem is that there are lots of people using these techniques for
> good reason. 'illegal' is a poor choice of language,

OK, "in violation of the RFCs which state that pipelining is not
allowed unless the receiver advertises the capability".

> SMTP is not an act of parliament, nor is it a particularly great
> design. If you need to send out a million mails to your customers as
> Ebay does every day you cannot wait around a minute while someone's
> idiot sendmail script runs.

Then eBay is going to run into mail rejection problems due to improper
pipelining (if eBay actually uses that technique, which I don't know).

Seth

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