Alberto Bertogli 8fab350b59 courier: DNS temporary errors should cause temporary delivery failures ...

In the SMTP courier, when the MX lookup fails with a DNS temporary
error, we should propagate that up and cause delivery to fail with a
temporary error too.

That way the delivery can be attempted later by the queue.

However, the code today doesn't make the distinction and will treat any
temporary DNS error as a permanent delivery failure, which is a bug.

The bug was found by ludusrusso and reported in
https://github.com/albertito/chasquid/issues/4

This patch fixes the bug by propagating the error properly.

2020-03-12 22:07:22 +00:00

..

courier.go

Distinguish between permanent and transient errors

2016-10-10 00:51:04 +01:00

procmail_test.go

test: Tidy up creation and removal of test directories

2017-07-14 02:02:43 +01:00

procmail.go

Use context.WithTimeout instead of context.WithDeadline

2019-07-13 13:44:25 +01:00

smtp_test.go

courier: DNS temporary errors should cause temporary delivery failures

2020-03-12 22:07:22 +00:00

smtp.go

courier: DNS temporary errors should cause temporary delivery failures

2020-03-12 22:07:22 +00:00