QUIT: If the email is sent, the consumer sends the Stop command on the server, severing the link. If it's been properly shut, the server will reply using a 221 code. Certificate-based connector configuration: Ensure that your on-premises email server is configured to use a certificate to ship email https://cesarvgmot.blogchaat.com/26706886/the-smart-trick-of-vmware-migration-that-nobody-is-discussing