They don't implement RFCs accurately because they're trying to send
faster/cheaper.
Actually, a lot of it is still because they're sloppy and inept. Not
all spammers are stupid, but a lot of them are. This one, for example
(I know, I was there):
http://www.justice.gov/usao/nj/Press/files/Rad,%20Christopher%20Verdict%20PR.html
Even e-bay for example had a problem when this "demand they wait for a
response" feature started to become popular because they too figured
out they could just dump one side of the SMTP conversation w/o waiting
for responses and it previously worked well enough and was much
"cheaper" on their servers.
That was just broken. There's a perfectly well specified way to do
SMTP pipelining, which lets clients skip most of the waits without
losing the responses.
R's,
John
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