Spamware could parallel connections to umpteen million recipients and
send at full speed if all it had to do was wait.
Absolutely, this code is not your standard mail client stuff.
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, 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.
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