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Re: We need an IETF BCP for GREY LISTING
On 17/10/2011 18:46, Keith Moore wrote:
BTW, Keith, many GL servers already have responses with hints.
yes, I know. but just because someone decided to add a %d to a printf doesn't mean it should be standardized.
I must be missing something. I'm struggling to see why so many people
think that changing a server that gives a hint from saying
421 This server implements greylisting, please try again in # seconds
421 [retry=#s] This server implements greylisting, please try again
in # seconds
could possibly be a bad thing...
If the [retry=#s] gets ignored, then, so what. If it's there then it is
much easier to parse for someone who decides they want to try to
cooperate with the other end
IMV, an experimental extension to 5321 saying that a 4xx response can
optionally have a "[retry=#s]" hint should be non-controversial and
straight forward. It may not achieve much, but it may help a bit, and it
would not have a down side as far as I can see.
Maybe there are other things to worry about in SMTP that could have more
benefit, but things like DKIM are a lot more complex to specify and
implement and are more likely to cause interoperability issues. What's
wrong with doing very simple things as well as the complex things?