Sent emails show web-hosting service provider (yahoo) to mail recipients!

Sent emails show web-hosting service provider (yahoo) to mail recipients!

One of my oldest domain-names is registered with yahoo and the associated website is hosted by yahoo. When I send an email from this domain-e-ddress with other email clients the recipients of my mails always see info@[my-domain-name].com as the sender. However when I send it through my newly set up ZOHO-mail it also mentions 'yahoo'. This looks unprofessional. How can I turn that off?