What you need to know about new Gmail security featuresOfficial Gmail Blog.
Google is now warning Gmail users about emails that are sent or received over non-encrypted connections. These messages are indicated by a red lock icon within Gmail's user interface.
Although it is important to be aware of the Gmail changes, for Listrak clients, the most important thing to know is that there is nothing to worry about. We have responded to the change, as Listrak Principal Delivery Strategist Andrew Wingle explains below.
According to Andrew, "We do not expect any major or immediate impact in deliverability for senders that are not using encryption; however, Listrak has enabled STARTTLS for all messages being sent to Gmail.com. STARTTLS is method of sending plain-text message with encryption using TLS as the security protocal."
He continues, "No direct changes need to be made for our clients. Clients can also request STARTTLS enabled for all outbound message or for a list of specific domains if they desire. We ask that they send any requests to enable wider implementation to their account manager or the support team."