Gmail warning - different from and reply-to address


New Email
I am using a CRM which uses a separate FROM: and REPLY-TO:

This was designed by the CRM which we use for our brokerage.

Every email which comes in has the GMAIL WARNING attached in a big yellow box...

Be careful with this message​

_________ is similar to a name in your organization, but the email address does not belong to your domain or _________ Mail couldn’t verify that it actually came from Avoid replying to this email unless you reach out to the sender by other means to ensure that this email address is legitimate.

What is the best way to go about fixing this problem?