How to confirm ServiceNow email server is using Opportunistic TLSIssue How to confirm ServiceNow email servers are using Opportunistic TLS ReleaseAll versionsResolutionFrom external network we can confirm that ServiceNow email servers are accepting TLS connection by sending ehlo message to one of our inbound MX records. Alternately, go to public websites as below and enter the domain i.e. service-now.com to check the same: https://luxsci.com/smtp-tls-checker (This is a third-party page, not sponsored or supported by ServiceNow.)