I went into settings on my Zoho app, but the only options under email are 

show thumbnails

smart group read emails

show attachments as thumbnails

clear search history

defualt swipe action

There isn't a notification settings in the Zoho app on my phone. I get a TON of emails throughout the day as I subscribe to lists, and so I have been turning my phone on silent, but then I miss texts and calls. 

I just want to turn off the sound for Zoho email notifications. How do I do this?