We need to be able to send emails internally using Marketo. However, our DKIM rule states that all emails with our company's domain has to be signed-by our company, which is a very common practice that prevents our emails from being spoofed. How do we get our emails to show that they are signed by us instead of mktomail.com to prevent our internal emails from going to spam?
When you set up a DKIM record for your Marketo email domains (using the selector M1 by default) they'll be signed as expected.
Go to Admin » Email to generate and copy your DKIM public key(s) to hand off to IT.