Transport Layer Security (TLS) is an encryption method that is used to encrypt a communication channel between two computers. It is the successor to Secure Socket Layer (SSL), and the two terms are often used interchangeably.
What is TLS?
TLS is widely used to encrypt connections over the Internet. For example, when a lock appears in your browser bar, your browser is encrypting communications between you and the website that you are connected to.
TLS can be used to encrypt email during transmission. Some recipients require it and refuse mail that is not TLS encrypted, but this practice is not common yet. There is a strong push to make the use of TLS a default.
The Transfer Layer Security (TLS) protocol is used to establish secure connections and encrypt communications across a network, ensuring that all transmitted data remains private. All client connections to Acoustic Campaign require TLS. This includes:
- Mobile app messages. For details on mobile app migration, refer to TLS 1.2 Migration for mobile push clients.
- Calling any of our APIs via any means
- Accessing the Acoustic Campaign via a browser on any device
- Transferring files to and from Acoustic Campaign using an SFTP tool or library
Does Acoustic Campaign encrypt with TLS?
Our systems utilize Opportunistic TLS Encryption. Which means that we attempt to open a TLS Encrypted connection to the destination mail servers at each ISP. If the destination server is configured for, and accepts TLS Encrypted connections, it will connect and deliver the mail. If the destination server is not configured for, and does not accept TLS Encrypted connections, then the mail is delivered using unencrypted connection.
TLS version support
On March 2, 2020, Acoustic Campaign removed support for TLS 1.0 and 1.1. Ensure that all mechanisms you use to connect to Acoustic Campaign support at least TLS 1.2.
To ensure that you don't encounter any problems with your connections to Acoustic Campaign, you need to:
- Update your API client and client libraries to use TLS 1.2.
- Ensure your workstations and mobile devices (if used) are updated with the most current version of the operating system and supported browsers, which will include support for strong protocols and ciphers.
This change does not impact outbound email (SMTP), SMS, or mobile message traffic.
For more information about TLS, see the following websites: