@Tanay Kumar Bal we are sending SMTP mail from Pega platform 8.4.4 to GE Healthcare SMTP server trying to use OOTB email integration rule. yesterday we got this configured and tested but only works with port 25. When we try to use port 587 with the SMTPS parameter checked for encrypted traffic the test fails. We are not sure yet if this issue lies inside the GE demarc or if it something in the platform. We are waiting to hear back from GEHC mail admin/security engineers for an analysis on their end. This is a new solution architecture for them and we are the lucky(?) first one to test this.