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Postfix Documentation
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Postfix DSN Support


Introduction

Postfix version 2.3 introduces support for Delivery Status Notifications as described in RFC 3464. This gives senders control over successful and failed delivery notifications.

Specifically, DSN support gives an email sender the ability to specify:

  • What notifications are sent: success, failure, delay, or none. Normally, Postfix informs the sender only when mail delivery is delayed or when delivery fails.

  • What content is returned in case of failure: only the message headers, or the full message.

  • An envelope ID that is returned as part of delivery status notifications. This identifies the message submission transaction, and must not be confused with the message ID, which identifies the message content.

The implementation of DSN support involves extra parameters to the SMTP MAIL FROM and RCPT TO commands, as well as new Postfix sendmail command line options that provide a sub-set of the functions of the extra SMTP command parameters.

This document has information on the following topics:

Postfix Documentation
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