On Tue, 11 Oct 2016, Jeremy Harris wrote:

On 11/10/16 10:24, Jeremy Harris wrote:
> On 10/10/16 16:27, Peter Gervai wrote:
>> https://tools.ietf.org/html/draft-ietf-dmarc-arc-protocol-00
>> Kind of signed "received" lines. It's implemented in GMail and AOL
>> test environments. Looks useful for trusted path checking.
> > It's more of a mmailinglist-software thing than an MTA thing,
> I think.

I'll modify that.  It's a mailinglist thing as regards generation;

Does "mailinglist" include forwarding ?
If so exim might want to generate too.

but the final receiving MTA wants a checking implementation.

The latter is where Exim might want to provide support.

Is ARC an all or nothing, or is it a scoring thing
that could be done by spamassassin ?

I note that section 10 warns that ARC could be mis-used
to force the checking server to make many DNS requests.
Perhaps a configurable limit should be included in the
implementation ?

Andrew C Aitchison

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