34 lines
1.4 KiB
Plaintext
34 lines
1.4 KiB
Plaintext
Postfix DSN support implementation notes
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========================================
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In delivery status reports, Postfix now properly reports remote
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LMTP/SMTP server replies with Diagnostic-Type: SMTP, with the
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Diagnostic-Code: equal to the server reply, and with Remote-MTA:
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equal to the name of the remote MTA.
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Of course Postfix still produces the same "informal" error descriptions
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that it produced before (for example, the error text that appears
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in the first section of a bounce report).
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Other error reports are not in the form of SMTP-style replies.
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- The Postfix LMTP/SMTP client generates Diagnostic-Type: X-Postfix
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for locally generated errors (host not found, connection timed out
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etc.). It generates Diagnostic-Type: SMTP only for replies from
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an SMTP server.
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- The queue manager generates Diagnostic-Type: X-Postfix for errors
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that it detects. It also receives error information from delivery
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agents and reports that information unmodified when it decides to
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"temporarily suspend" a delivery channel.
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- The "pipe to command" code in local(8) and pipe(8) produces
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Diagnostic-Type: X-UNIX, and Diagnostic-Code: text that is taken
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from /usr/include/sysexits.h or from the command output.
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- The code that delivers to mailbox produces Diagnostic-Type:
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X-Postfix and Diagnostic-Code: text that is the same good old
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Postfix error message that we are already familiar with. Typically
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these are errno-style reports about locking a file or appending a
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file.
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