Verify the ReplyTo address to send emails using this account.

Verify the ReplyTo address to send emails using this account.

Zoho Mail Internal Error (500) - You need to verify the ReplyTo address to send emails using this account. Please verify the ReplyTo address.

How can I do the above? I am sending emails from wordpress. The current replyto address is forced the same as the from address. email@zoho.com. How can I verify this?