> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf Of J.D. 
> Falk
> Sent: Wednesday, June 29, 2011 7:24 PM
> To: Message Abuse Report Format working group
> Subject: Re: [marf] I-D Action: draft-ietf-marf-authfailure-report-00.txt
> 
> If Delivery-Result: is required, then I expect we'll see a lot (perhaps
> a majority) of implementations being intentionally non-standard and
> omitting it anyway.  Mailbox providers tend to be /very/ touchy about
> who they'll share exact delivery results with, and for good reason: the
> bad guys have lots of incentives to try to trick their way into
> delivery feedback results that they can use to tune their spamming
> systems.
> 
> I'd urge making that an optional field, or possibly include a
> null/refused value.

Just to be clear, you mean that in the context of auth-failure reports 
specifically, and not ARF in general?

I'm thinking if you're willing to update your feedback generation system to 
support auth-failure reports, then you understand what's involved and would be 
willing to do this as well.  But I don't run an FBL myself (yet) so I admit 
this is speculation.
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