I need to be able to see the system e-mails I send from Zoho Invoice and I understand  that if I had chosen to use mail programmes such as GMail or Outlook  then I could have integrated and had this feature.

However, I chose to use Zoho Mail and and now understand that I am disadvantaged because as there is no integration available like with the non Zoho programmes? 

Zoho this is not a good look making other providers products superior to your own?  

Can this integration be developed ?