DKIM signature was not working properly on webmail since replying to 2nd email onwards.

Problem reported by Pan tigon - 10/4/2020 at 9:02 PM

Submitted

I have successfully configured DKIM on my domain.
When I started sending an email from Smartermail's Webmail to an email address of Gmail, I signed DKIM to successfully authenticate at Gmail's webmail. Then from Gmail's Webmail I reply to that email (email address in Smartermail). After my email address at Smartermail receives a mail from Gmail, I reply to that email. After the email was received in Gmail's webmail, Gmail reported the wrong DKIM signature (dkim = neutral (body hash did not verify)).
The DKIM signature is only wrong when I use Smartermail Webmail, but when I use Outlook App as well as above, it does not happen.

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Ben Rowland Replied

10/8/2020 at 8:48 AM

Hi, I am also having DKIM problems (on 7577).

I have been using these tools to test it: https://appmaildev.com/en/dkim and https://dkimvalidator.com/

I use DKIM for many domains, but one has reported an error, and I've been able to confirm it. I receive this error when a receiver attempts to validate the DKIM signature: DKIM-Result: fail (bad signature).

SmarterMail successfully enabled DKIM for the domain, which does a DNS check to ensure the record is in DNS correctly, so I'm not sure what the problem is. I've tried adjusting the parameters - key size, relaxed, simple, etc. but it fails each time.

I have enabled DKIM for all of our domains, assuming that SmarterMail's validation was working, but now I'm not sure this feature works.

Ben Rowland Replied

10/9/2020 at 11:09 AM

FYI, SmarterTools checked this out and confirmed a problem. It's really weird because it's only happening with one of our domains, not all of them, which makes this particularly tricky to debug.

Douglas Foster Replied

12/14/2020 at 7:33 AM

I just tried to reproduce your symptoms, and cannot do so.

Both the initial message and the reply-to-reply message are verified by Google with both SPF PASS and DKIM PASS

Ben Rowland Replied

12/14/2020 at 8:03 AM

Thanks for trying. All but one of my domains work just fine. This is the hardest kind of problem; once where there is intermittent failure. They have added additional logging to this for me to try to recreate the problem.

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