Allow external SMTP configuration for mail sent from Zoho Books. This will allow mail to be sent verified from an organization's own official mail server vs. "spoofed" and go into spam alot of the time. I had a client behind over a month on several invoices after switching to Zoho books -embarrassingly for us - all our invoicing was going straight to their spam folder because it wasn't routing through our o365 exchange online mail.

This is a VERY important feature to have, and I'm very surprised a paid service does not currently have it already.