We had scheduled a campaign from Zoho Campaigns 

It shows It has has been delivered to 1.2L subscribers and the open rate is literally 0 % .. 

I checked my mail id report .. It shows that the mail had been delivered 41 mins ago and I ve not yet received any mail .  There are no deliveries of the mail to the recipients

Had raised a ticket yesterday 70901853 and its still pending ..

Attached the screenshot of the delivery report and non receipt of mails to the customer.