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Diffstat (limited to '')
| -rw-r--r-- | implementation-notes/DSN | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/implementation-notes/DSN b/implementation-notes/DSN new file mode 100644 index 0000000..0d81585 --- /dev/null +++ b/implementation-notes/DSN @@ -0,0 +1,33 @@ +Postfix DSN support implementation notes +======================================== + +In delivery status reports, Postfix now properly reports remote +LMTP/SMTP server replies with Diagnostic-Type: SMTP, with the +Diagnostic-Code: equal to the server reply, and with Remote-MTA: +equal to the name of the remote MTA. + +Of course Postfix still produces the same "informal" error descriptions +that it produced before (for example, the error text that appears +in the first section of a bounce report). + +Other error reports are not in the form of SMTP-style replies. + +- The Postfix LMTP/SMTP client generates Diagnostic-Type: X-Postfix +for locally generated errors (host not found, connection timed out +etc.). It generates Diagnostic-Type: SMTP only for replies from +an SMTP server. + +- The queue manager generates Diagnostic-Type: X-Postfix for errors +that it detects. It also receives error information from delivery +agents and reports that information unmodified when it decides to +"temporarily suspend" a delivery channel. + +- The "pipe to command" code in local(8) and pipe(8) produces +Diagnostic-Type: X-UNIX, and Diagnostic-Code: text that is taken +from /usr/include/sysexits.h or from the command output. + +- The code that delivers to mailbox produces Diagnostic-Type: +X-Postfix and Diagnostic-Code: text that is the same good old +Postfix error message that we are already familiar with. Typically +these are errno-style reports about locking a file or appending a +file. |