SMTP TLS (Transport Layer Security for email delivery) is a mechanism email servers can use to pass email between themselves in a secure manner. In essence, two servers which both support TLS first establish an encrypted channel of communications and then they pass email through it, ensuring that the messages are secured during transmission between the servers, even if the messages themselves were not already encrypted.
SMTP TLS is great when your recipients email servers support it. However, many recipient's servers do not (how to tell, TLS support checker tool) — for these, other modes of SecureLine, such as Escrow, will be automatically used when encryption is required.
Opportunistic TLS and Forced TLS
With SecureLine, you can take advantage of the simplicity of TLS encryption when it is possible and know that security will "fall back" to another method when it is not possible or when the recipient's servers no longer support it.
Forced TLS for Banks
When communicating with many companies (such as banks), "Opportunistic TLS" is insufficient. These organization REQUIRE you to never send them email if it is insecure, even if that is because their own servers are broken. "Forced TLS" handles this.
If you communicate with an organization, like Bank of America, that requires enforced TLS (but where you do not otherwise need to use SecureLine encryption services), LuxSci can ensure that all email to that organization goes over TLS or is never sent. SecureLine licenses are not even required for this — only an official request for that from your recipients.
SecureLine SMTP Forced TLS Features