Duplicate precedence header tripping up Amazon SES

[racke]

Precedence: list
Precedence: bulk

This is causing Amazon SES to reject the message, thus it is a quite serious problem.

status=bounced (host email-smtp.eu-west-1.amazonaws.com[52.30.4.9] said: 554 Transaction failed: Duplicate header 'Precedence'. (in reply to end of DATA command))

[racke]

See https://github.com/sympa-community/sympa/blob/master/src/lib/Sympa/Spindle/TransformOutgoing.pm#L89.

[ikedas]

Precedence: field has no standard definition. Duplicate fields with values list and bulk were intended (See also below).

I suppose a better solution is removing this (these) field, if we can confirm that the other measures to prevent mail loop are sufficiently effective.

---

1. RFC 2076, 3.9. "Precedence:".
2. [sympa-users] Handling out/of/office replies to list. Dec. 2007.
3. The first commit.

[racke]

We actually need this field to prevent autoreplies hitting the list, but it should be configurable instead of hardcoded. That would solve my problem.

[ikedas]

@racke, does PR #152 solve the problem?

[ikedas]

As PR #152 was merged, this issue is closed.