How to get rid of 'via zohocrm.com' in the mail received by the customer.

How to get rid of 'via zohocrm.com' in the mail received by the customer.

When i send an email to the customer via zoho crm, it displays ' via zoho crm' beside my name. How can i get rid of it, it is bad for business because it reduces the authenticity of my email. Need help as soon as possible.
Anil.