I have some problems with the email function in interactive reports.
In the mail log report, no errors are shown, but the email is not deliverd.
Also in the sample application it doesn't work.
Only the mail log report unther apex_admin works and is deliverd.
I can also send mails in my own page with the apex_mail built in.
I have just discovered the same issue, only when the interactive reporting email functions what I refer to as a larger report, i.e. 400 rows and greater the email passes the spam software and is delivered, when the report is smaller, i.e. 100 rows the email receives a spam score that does not allow it to be delivered. Of course I do not have a clue as to the difference in the data stream that causes the problem as both reports come from the same application and function. Our server group is reviewing the spam software and hopefully will resolve.