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courier: Improve delivery error messages

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Delivery errors can be visible to the end-user via DSN responses, and
some of them are not very clear, or are missing useful debugging
information (such as the MX).

This patch improves the messages by including the MX where appropriate,
having explicit errors for cases where no servers are found/allowed, and
using less technical language for the common explanations.

There are no changes to the behaviour on errors, this change only
affects the messages.
This commit is contained in:
Alberto Bertogli
2026-10-03 11:36:19 +01:00
parent bfb9694f0c
commit d74e6e3d2b
5 changed files with 219 additions and 38 deletions
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test/t-16-spf/expected_dsn
+2 -2
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@@ -26,7 +26,7 @@ Delivery of your message to the following recipient(s) failed permanently:
Technical details:
- "userB@srv-b" (EMAIL) failed permanently with error:
MAIL+RCPT 550 "5.7.23 SPF check failed: matched all"
srv-b.: MAIL/RCPT failed: 550 "5.7.23 SPF check failed: matched all"
--???????????
@@ -40,7 +40,7 @@ Original-Recipient: utf-8; userB@srv-b
Final-Recipient: utf-8; userB@srv-b
Action: failed
Status: 5.0.0
Diagnostic-Code: smtp; MAIL+RCPT 550 "5.7.23 SPF check failed: matched all"
Diagnostic-Code: smtp; srv-b.: MAIL/RCPT failed: 550 "5.7.23 SPF check failed: matched all"