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[dispatch] SMTP Code for Undesirable Messages

"Brotman, Alex" <Alex_Brotman@comcast.com> Fri, 17 December 2021 17:05 UTC

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From: "Brotman, Alex" <Alex_Brotman@comcast.com>
To: "dispatch@ietf.org" <dispatch@ietf.org>
Thread-Topic: SMTP Code for Undesirable Messages
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Date: Fri, 17 Dec 2021 17:04:46 +0000
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Subject: [dispatch] SMTP Code for Undesirable Messages
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Hello,

I've been wondering if it may be beneficial for a mailbox provider to be able to signal back to the sender that the message is being accepted, but is undesirable based on some criteria.  The idea would be that a provider may evaluate some characteristics of the message, and before issuing a "250 Ok" have already determined the message would be routed to the spam folder.  Something as simple as:

255 Ok - Routing to spam folder

This would likely need some "Security Considerations" section about how informing a malicious entity may be undesirable.  I'm willing to write this up as a proposed draft, though I'm not entirely sure where to direct that draft.  Thank you for any advice you could provide.

--
Alex Brotman
Sr. Engineer, Anti-Abuse & Messaging Policy
Comcast

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