[Mailman-Users] DKIM / DMARC woes...

Mark Sapiro mark at msapiro.net
Thu Sep 21 17:23:11 EDT 2017

On 09/21/2017 12:37 PM, Grant Taylor via Mailman-Users wrote:
> Does setting from_is_list and / or dmarc_moderation_action to munge
> cause Mailman to do anything with existing DKIM-Signature headers?  Will
> they be removed or left there?

The default behavior does nothing to DKIM related headers. This is from

> # Some list posts and mail to the -owner address may contain DomainKey or
> # DomainKeys Identified Mail (DKIM) signature headers <http://www.dkim.org/>.
> # Various list transformations to the message such as adding a list header or
> # footer or scrubbing attachments or even reply-to munging can break these
> # signatures.  It is generally felt that these signatures have value, even if
> # broken and even if the outgoing message is resigned.  However, some sites
> # may wish to remove these headers.  Possible values and meanings are:
> # No, 0, False -> do not remove headers.
> # Yes, 1, True -> remove headers only if we are munging the from header due
> #                 to from_is_list or dmarc_moderation_action.
> # 2 -> always remove headers.
> # 3 -> always remove, rename and preserve original DKIM headers.

Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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