DKIM Split

[OwenC]

HI all... Been around a looong time, but here is my first post....
I got a lot of email problems at the moment, but I'll just need to work thru them one at a time...

SO my first hurdle is.. I'm trying to get DKIM working properly.
My Domain Name registrar only allows 256 bit txt records, which MUST be enclosed in quotes.
When I use the SPLIT function in cPanel, the first part of the record ends up at 258 characters.
Why.. because there are two spaces.. v=DKIM1; k=rsa; p=MIIBI one between the ; and k and one between ; and p.

Assuming it's safe to remove the spaces, and after a lot of "trial and error", I find I can get a "Green Light" in the MXtoolbox DKIM test IF I insert
"v=DKIM1; k=rsa; p= at the start of the SECOND part of the split.
Mind you, I can NOT get a good result from DKIM testers on dmarcanalyser.com or mail-tester.com in any case.

Please point in the correct direction!

 

[cPanelLauren]

So, registrars and DNS hosting providers alike should be starting to support more complex DKIM signatures but for the ones that don't splitting them is the only recourse.

We have had some other threads where the users were able to successfully split the record:

DKIM key split over several records not working

Hi. I am using Cpanel version 11.52.0.18. I want to set up DKIM for one of my domains. I'm using the Cpanel-generated key, which I have adapted (removing extraneous " and space from the middle and \; from the end) so that it is apparently acceptable (I checked it here: Check a DKIM Core Key)...

forums.cpanel.net

Example DKIM record that does not fail

Hello, when using cPanel's generated DKIM, e-mail headers says DKIM=fail: So i used DKIM checkers like Check a DKIM Core Key and DKIM Key Checker and it says my DKIM is invalid: "The p= field must be base64 encoded" The checker was also not happy about " mark at the beginning of the record...

forums.cpanel.net

SOLVED - Error in DKIM core record

I was checking email delivery for a new account I had set up on a cPanel VPS and found that the outgoing email sent from an email account on the VPS and received at my Gmail GSuite account showed a DKIM fail in the headers - the email landed in my GSuite spam folder as the SPF record was in...

forums.cpanel.net

I'd suggest looking through those, maybe the split was configured incorrectly?

 

[QAZwsxED]

I recently solved a similar issue.
Solution: manually add a Message-Id (note not a Message-ID) header then connect and send an email.
cPanel WHM adds a Message-ID header and re-arranges the 'h' record in the DKIM signature which invalidates it, causing a DKIM:fail in the recipients mailbox.