Hello,
I installed EASendmail in my ASP.NET C# project. I have lot of mail database. I want to check that mail working or not. So I send mail through
my project and I want to check delivery status either mail or delivered or not according to that I want to update status in my database but I am getting below error.
"no supported delivery status notification marshal found"
I used gmail SMTP server. Please someone help me to solve this problem.
I am very grateful for that.

Your server doesn’t support DeliveryNotification.

Don’t add this line oMail.DeliveryNotification = DeliveryNotificationOptions.OnFailure | DeliveryNotificationOptions.OnSuccess;
You can still get failure report, but there is no success report, you can take the recipient is valid you don’t receive failure report in 24 hours.