Email Marketing Extension will transform VTiger into sophisticated email marketing/campaign tool. It will include a step by step wizard, easy to use “marketing list” (to load contacts/leads/organizations), review & send + confirmation/summary view that shows exactly what and when is going to be sent.
How to See Opened Emails Sent from VTiger
Go to the Menu > Marketing > Email Marketing and Open a Sending/Sent campaign.
In Summary view you can see the number of Opened Emails as well as the percentage.