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Re: [ietf-smtp] Per-Recipient Data Responses

2014-03-06 11:12:18
On 06/03/2014 17:03, Carl S. Gutekunst wrote:
Ned Freed wrote:

Rather than discarding I think it is better to file into a quarantine or spam mailbox. This gives recipients a better way of dealing with questions
about missing messages, without involving the postmaster.

Also an option, and one we support, but in my experience rarely used in

Dropping the message into the quarantine is the "last choice" action for disposition conflicts on the Postini and SonicWALL proxies. It's also one that gets calls to customer support. ("I set the policy to reject this, how comes it got into my spam folder?")

This is my issue with PRDR.

If a user set 'discard if x,y,z', and the sender doesn't support PRDR, we have to either:

- discard the message silently (ugh)
- send a bounce message back (backscatter)
- quarantine the message (support issues, as above)
- fake PRDR by temp rejecting the message, then on the next retry only accept one recipient at a time (double-ugh)

At the moment we just don't give the user an option to 'discard'. Their bad messages get quarantined - but that's what they know will happen, so at least it's deterministic, even if not exactly what the user wants. Having a 'sometimes discard, sometimes quarantine' option would be nasty from a user's PoV.


Paul Smith Computer Services
Tel: 01484 855800
Vat No: GB 685 6987 53

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