Precedence: header in email

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There is a RFC 3834 dedicated for automated email responses.

In short, it recommends:

  1. Send auto-responses only to address contained in the Return-Path header of an incoming message, if it is valid email address. Particularly “<>” (null address) in the Return-Path of the message means that auto-responses must not be sent for this message.

  2. When sending auto-response, MAIL FROM smtp command must contain “<>” (null address). This would lead to Return-Path:<> when message will be delivered.

  3. Use Auto-Submitted header with value other than “no” to explicitly indicate automated response.

One note: it is not worth to explicitly set Return-Path header in outgoing message, as this header must be rewritten by envelop address (from MAIL FROM smtp command) during delivery.

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