On 02/Mar/10 23:47, Joseph C. Lininger wrote:
> Is anyone here successfully using DKIM with Courier? In particular, I
> would like to be able to do the following.
>
> 1. Sign mail that comes in from an authenticated user with a digital
> signature before sending it on to it's final destination.

I've being doing that for a few days now.

> 2. Verify the digital signature of a message if it has one and take
> action on the message. For example, I am using greylisting via
> pythonfilter. I'd like messages that have a valid digital signature to
> be able to avoid greylisting.

That may also be possible. Currently, I verify with the same filter I 
use for signing, which probably creates a problem with the order that 
filters run, since signing should be the last thing.

> Does such an animal currently exist? Ideally something that fits into
> the pythonfilter framework would be good.

I wrote it in C, using libopendkim.










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