Emails sent from PDC are sent from *.smtp-out-amazonses.com. The domain is spoofed so the email looks like it is from pega.com. Our email anti-spoof scanning is picking this up and rerouting the emails to the junk folder as a precaution. We added pega to our "allowed to spoof" whitelist to coprrect this for now. Pega will need to update the DNS so that the SPF records are set up correctly.