Re: Where/when to insert a missing Message-ID

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Where/when to insert a missing Message-ID
\ Mark Martinec (21 Jan 2008)
. \ (Wietse Venema) (21 Jan 2008)

Subject:	Re: Where/when to insert a missing Message-ID
Group:	Postfix-users
From:	(Wietse Venema)
Date:	21 Jan 2008

Mark Martinec:
> Here is one not-too-important issue.
>
> When checking some incoming mail signed with historical DomainKeys signatures
> without an 'h' tag (no list of signed headers, implying all are signed),
> I see one source of these messages (bulk, but legitimate commercial junk)
> which is consistently failing signature validation because the sender did not
> provide a Message-ID in its posting, and our receiving Postfix appended a
> Message-ID at the end of the header, this breaking a signature.

By the time any Postfix change reaches significant deployment,
the DomainKeys usage would hopefully be insignificant.

Wietse

> I can see three possibilities:
> - change Postfix to prepend a missing Message-ID, instead of appending it;
> - change Postfix to add a missing Message-ID only for mail matching
> the local_header_rewrite_clients setting;
> - not to bother (as DKIM no longer suffers this problem, making an 'h'
> tag obligatory)
>
> Mark
>
>