dkim=fail on reply

[tstar]

Hello!

Noticed a strange thing. When you send the first letter, gmaill (and the other servers) says there are no errors, dkim=pass. But for answered letters from these servers an error dkim=fail. At the same time the letter still has the dkim signature: dkim-signature: v=1; a=rsa-sha1; s=mail; d=secret.com; c=relaxed/relaxed; q=dns/txt; h=Date:From:Message-ID:Subject:To; bh=bla bla bla;
It's just I have this problem?

Exchange 2013 CUE6, Exchange DKIM Signer v2.0.2.

Thank you.

[Pro]

You mean for example the following scenario:

You send an email from tstar@example.org to userxy@gmail.com (goes through dkim-exchange -> DKIM pass)
UserXY sends you a response from his address userxy@gmail.com (DKIM pass)
Now you answer with your tstar@example.org email address (goes through dkim-exchange -> DKIM fail)

I'll investigate this problem today evening.
Can you in the meantime check the EventLog (in the DKIMSigner GUI) if this email really gets signed by dkim-exchange and also check if the dkim-signature header is rewritten. Thanks!

[tstar]

Scenario you described is correct.
No problems found in the log files for these letters. Example:
2014-09-15T16:14:57.000 Signing mail with header: dkim-signature:v=1; a=rsa-sha1; s=mail; d=secret.com; c=relaxed/relaxed; q=dns/txt; h=Date:From:Message-ID:Subject:To; bh=cEgV5lHnd8sUXTgLvdj4/WfSHto=; b=VXoTepW6HYUO/j8d94nMoP/KpiwRlybabmcRpSt/KiW36kC1nBiSJhyAzXV+sNqdMhHCuJqPbI4IOKVcrMRC50Ee270zpCS1MJtgRks3I/G3pWWtj5iEJp/wMhLKXZq4IiOOYe3MlwwoJ7RmqDdEdX11HsiXtJ07K/xcAuf5YGw=;
I can send a test email to your personal address if you tell it to me.

Sometimes the log files in an error like:
2014-09-15T15: 32: 24.000 Signing a mail item according to DKIM failed with an exception. Check the logged exception for details.
System.NullReferenceException: Object reference not set to an instance of an object.
    in Exchange.DkimSigner.DkimSigningRoutingAgent.SignMailItem (MailItem mailItem) in d: \ Programmieren \ dkim-exchange \ Src \ Exchange.DkimSigner \ DkimSigningRoutingAgent.cs: line 80
    in Exchange.DkimSigner.DkimSigningRoutingAgent.WhenMessageCategorized (CategorizedMessageEventSource source, QueuedMessageEventArgs e) in d: \ Programmieren \ dkim-exchange \ Src \ Exchange.DkimSigner \ DkimSigningRoutingAgent.cs: line 56

But I do not think that this is something to do with this problem.

[Pro]

Ok, thanks for your Info! I'll test it on my server, fix it and let you know the results.

Regarding the second log message I created a new issue, because there shouldn't be any excpetion: #63
If an exception ocurrs (like this one) the agent simply doesn't sign the email so it should be DKIM=pass and not fail, thus this exception probably has nothing to do with the scenario.

[Pro]

@tstar I could reproduce the problem but couldn't yet find the bug, it's quite strange why this happens. I need stil some time to investigate.

[tstar]

I do not know whether there is a relationship, but I noticed that sometimes the problem began to appear spf=fail on gmail after connecting dkim. And this is very strange.

[Pro]

@tstar this should be fixed now in version 2.0.3. Thanks for your bug report!

[tstar]

Now gmail says spf=pass, dkim=pass, dmarc=pass for all emails. Everything is fine.
Thank you for your work and great support!