can't change my avatar

can't change my avatar

1. I have set up my email through Zoho, it started working good, but sometime i got many calls from people who have sent me emails, and i didn't receive them. and contrary!
thanks you!
2. I can change my avatar in zoho mail inbox, but in received mail inbox (gmail, yahoo, ...) i can't see my changed avatar. Thanks!
i used  Standard 10GB mail zoho.