TLS and SMTP protocol usage

Products

• Email Security.cloud

Issue/Introduction

When does Email Security.Cloud uses TLS instead of the SMTP protocol for sending emails?

Environment

Email Security.cloud

Resolution

By default, the sending mail connections in Email Security.Cloud uses the same protocol that the message was received with. For example, if the email was delivered to Symantec cloud for scanning and the protocol used was unencrypted (SMTP), then after scanning we would also use SMTP when delivering the email. If the email was delivered to Symantec using TLS, then we would use TLS for the final delivery after scanning.

Note: The only exceptions to this are if the account has an Encryption enforcement set or if the Policy Based Encryption is being used. In those cases, we would only use TLS to send the email.