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

2004-05-18 00:19:42
"Hallam-Baker, Phillip" <pbaker(_at_)verisign(_dot_)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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