While running a CER job, if e-mail notification and report delivery on e-mail is configured, only notifications get delivered and not the reports
Error sending email notification in report refresh job! : System.Net.Mail.SmtpException: Failure sending mail. ---> System.IO.IOException: Unable to read data from the transport connection: net_io_connectionclosed.
Contrary to common belief, reports are e-mailed by DPS in reporting role and not by application server. In this case DPS was not added to the allowed list of addresses on the SMTP server properties.