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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
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.
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Ben Rowland Replied
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.

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