Hi Kyle. As you type a response, try clicking on the bar at the top with the recipient’s email address. This should expand the window, and you should see an arrow next to your email address in the “From” field. Click this arrow and you should now be able to select your Zoho mail address.
Hi Mahendra. The Zoho team has recommended users with this error code try resetting their Zoho Mail password. It sounds like it might simply be a glitch in their system that doesn’t recognize your password. If the problem persists, they recommend contacting their support team: support