iPhone to Zoho Mail say "on behalf of"

I have an iPhone connected to Zoho Mail and every time I send an email from the iPhone it say jsmith@zoho.com on behalf of jsmith@mydomain.com. However, when I use the

Zoho Mail client and send an email it sends it as jsmith@mydomain.com, which is what I want.

This is also how I have it setup in my settings. Is it possible to get rid of the "on behalf of" when

sending from the iPhone?