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[ietf-dkim] DKIM and mailing lists

2006-01-18 03:41:07
Hi

This message is about support of DKIM by mailing list software. Please excuse me if this topic as allready been discussed in this list (it's quite hard to read all the message from this list).

I think deployment of DKIM require a good support of DKIM by some of the major mailing list software. I am one of the author of Sympa mailing list software and I feel concerned by this. What a mailing list manager must do with DKIM ?

From my understanding, the minimum is to preserve existing DKIM-Signature: header and not modify the message in a way that will alter the signature. For this issue, existing specification are quite clear (the difficulties are only related to headers that must be preserved where most availible libraries to modify message headers don't garanty headers lenght line and headers order).

It will be also very powerfull to exploit DKIM signature as an authentication method when the context require to verify user privilege. This can replace email confirmation chalenge in many cases. This can be done also quite easily.

What are the other issue related to mailing lists ? In which case the mailing list server need to apply it's own signature to a message ?

Serge Aumont

ps : internet2.edu is just starting a working group about mailing list and DKIM

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