Can anyone share how to get DKIM authentication passed/setup correctly for RT?

I recently testing RT 5.0.3 and try to implement DKIM for my domain. I managed to get DKIM alignment passed but wonder if I should get DKIM Authentication passed too. The error is about bh does not match with expected hash when testing with mxtoolbox tool.

Hey fantonis_nus, can you include information about how DKIM is configured for you, what package you installed, how it’s integrated with your MTA, and what specific configuration you updated on your server. I’m using OpenDKIM with Postfix and DKIM is working fine, but I did have issues with default sendmail MTA initially.