Mailing List Archive: exim: users

4.70 pre-release DKIM signature generation problems

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exim at 8t8

Oct 28, 2009, 1:50 PM

Post #1 of 3 (152 views)
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4.70 pre-release DKIM signature generation problems

I am testing the 4.70 pre-release, using the Debian packages provided at
http://www.bebt.de/debian/dists/lenny/exim4/ (I've compiled the src
packages myself).

I am running a mailman server. Mailman is configured to strip received
DKIM headers, by setting the 'REMOVE_DKIM_HEADERS = Yes' option. Exim
is then configure to add a DKIM signature on the remote_smtp transport.

I've created a test mailing list with a Fastmail, GMail, and a Yahoo
email address subscribed. Emails sent from the Fastmail and GMail
addresses are generating a correct DKIM signature through my server.
However, emails sent from the Yahoo email address are generating
incorrect DKIM signature.

Copies of the failing and passing emails are at:
http://www.8t8.us/dkim_examples/

Since I don't know much about how DKIM signature work, I'm not sure why
the signatures are invalid, and hope someone here can give some advice.

Thanks,

-Kevin

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tom at duncanthrax

Oct 29, 2009, 7:07 AM

Post #2 of 3 (134 views)
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Re: 4.70 pre-release DKIM signature generation problems [In reply to]

Kevin McCarthy wrote:

> I've created a test mailing list with a Fastmail, GMail, and a Yahoo
> email address subscribed. Emails sent from the Fastmail and GMail
> addresses are generating a correct DKIM signature through my server.
> However, emails sent from the Yahoo email address are generating
> incorrect DKIM signature.
>
> Copies of the failing and passing emails are at:
> http://www.8t8.us/dkim_examples/
>
> Since I don't know much about how DKIM signature work, I'm not sure why
> the signatures are invalid, and hope someone here can give some advice.

Thanks for helping with debugging!

I have fixed the problem in CVS/GIT. You can either clone git and
compile yourself, or prod the maintainers of the debian packages to do a
fresh build. :)

/tom

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exim at 8t8

Oct 29, 2009, 4:43 PM

Post #3 of 3 (134 views)
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Re: 4.70 pre-release DKIM signature generation problems [In reply to]

Tom Kistner wrote:
> I have fixed the problem in CVS/GIT. You can either clone git and
> compile yourself, or prod the maintainers of the debian packages to do
> a fresh build. :)

I have confirmed the fix on my side. Thank you very much for the rapid
response!

-Kevin

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