You might send your A / B variants to your full list rather than an initial test segment, hoping to learn more about what tactics will work on future messages. (epolitics.com)
This can do damage to your brand and reduce the potential for your clients to open future messages. (lawyerist.com)
This is the number one thing you can do to protect your past messages, and prevent future messages that you receive from being read by an attacker. (law.hukuki.net)