Mailbox Behavior using Mac Mail IMAP

Mailbox Behavior using Mac Mail IMAP

Can someone please assist me on how to set up my mailbox behaviors in Mac Mail's settings for IMAP? I am getting 2 copies of Sent Messages (after sending a message), I have told sent folder within Zoho to "behave as sent mailbox", could that be why??

I just need these mailboxes straightened out, so I can feel confident using Zoho in Mac Mail, iphone and on the web when I'm away from home.

I love the mail service!!