OT Re: sa users list down due to irene?

[Michael Scheidell <mi...@secnap.com>]

On 8/29/11 8:49 PM, Lawrence @ Rogers wrote:
> What about Yahoo, which is not only freemail, but also used by the 
> biggest ISP here in Canada (Rogers)?
sometimes its hard to explain to a client. :-)
They blame the SA based spam filter for losing email.

if {freemail server} sends email to 250 of your most important users, 
all at once...  and you send the '250 ok' the first 100 times, and '4xx' 
retry later, some of the freemail servers will just drop the 
conversation and start over.

then again, some freemail servers will send 250 individual copies, and 
make about 30 parallel connections to your smtp server.

some won't retry for a day or two.

(some of you running graylisting know what I mean, which is why you need 
to whitelist large providers against graylisting.
their interpretation of 4xx is different than how we would expect it to 
work)

ah., the joys of RFC compliance. I remember POSIX compliance in years past..
as in POSIX SAYS: you need two headlights and 4 tires.

NORMAL people would expect the headlights to be in front, and the tires 
somewhere where it helps the car to roll.. but, POSIX didn't state 
EXACTLY where they needed to be.

same with RFC compliance.  (which I think still says that you should 
send an NDR if you can't deliver the spam :-)

getting OT here, just ranting this am.

-- 
Michael Scheidell, CTO
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