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Re: [apps-discuss] Comments on draft-ietf-appsawg-greylisting-03

"John Levine" <johnl@taugh.com> Fri, 17 February 2012 20:26 UTC

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Date: Fri, 17 Feb 2012 20:26:33 -0000
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From: John Levine <johnl@taugh.com>
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Subject: Re: [apps-discuss] Comments on draft-ietf-appsawg-greylisting-03
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>If the SMTP server sends a 421, it would force the connection to 
>close.  The usual implementations usually provide some text with the 
>450.  The 421 comment I have seen was generic.
>
>I'll presume that a 421 means "service unavailable" as described in 
>RFC 5321.  BTW, 421 is sometimes used for load shedding.

Quite possibly, but what would a client do differently?  Remember
that the client is software, it only looks at the code, not the
text.  My clients treat all 4xx the same, go away for a while,
until the aggregate while gets so long that it gives up.

R's,
John

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