[exim-dev] [Bug 2947] New: dkim=fail (signature did not veri…

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Autor: admin
Datum:  
To: exim-dev
Neue Treads: [exim-dev] [Bug 2947] dkim=fail (signature did not verify) delivery to Microsoft Exchange
Betreff: [exim-dev] [Bug 2947] New: dkim=fail (signature did not verify) delivery to Microsoft Exchange
https://bugs.exim.org/show_bug.cgi?id=2947

            Bug ID: 2947
           Summary: dkim=fail (signature did not verify) delivery to
                    Microsoft Exchange
           Product: Exim
           Version: 4.95
          Hardware: All
                OS: All
            Status: NEW
          Severity: wishlist
          Priority: medium
         Component: DKIM
          Assignee: tom@???
          Reporter: drandre222@???
                CC: exim-dev@???


After searching the bug forums here, I could not discover any relevant or
similar issues. Since this appears to be originating from Exim email, I am
opening a specific case on the DKIM failures.

Using cPanel and the Exim servers to send fullly authenticated emails (DMARC,
DKIM, and SPF), we are receiving DKIM error from receiving emails from emails
sent from Exim servers to Microsoft servers. Sending emails to Gmail, Yahoo,
AOL, iCloud, and other third parties the emails arrive with standard pass
headers.

Below are the header results from the email from Exim to O365 Exchange:
> Authentication-Results: spf=pass (sender IP is xx.xx.xx.xx)
> smtp.mailfrom=usservicecenter.net; dkim=fail (signature did not verify)
> header.d=usservicecenter.net;dmarc=pass action=none
> header.from=usservicecenter.net;compauth=pass reason=100


Here are the header results from the email from Exim to Gmail:
> ARC-Authentication-Results: i=1; mx.google.com; dkim=pass 
> header.i=@usservicecenter.net header.s=default header.b=NZsAFDFG;
>        spf=pass (google.com: domain of andre@??? designates 
> xx.xx.xx.xx as permitted sender) smtp.mailfrom=andre@???;
> dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=usservicecenter.net



Our service provider states this is a known issue and there are no solutions.
The DNS records are correctly set.

The records have been validated even through online checkers such as:
(1) https://dkimvalidator.com/
(2) https://dmarcly.com/tools/ (emailing check@???)


They are currently using exim (4.95-6.cp11104) and exim-26.

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