I hope all is well. I wanted to open a dialogue with you to better assist us in understanding your business needs here. I'm a big advocate for this feature since I'm personally very privacy centric with my security best practices. Our CEO Tim and I have been discussing the idea of implementing a feature to restrict non-TLS connections however there have been a few concerns brought up.
Disabling the acceptance of non-TLS connections will cause a major drop in your mail volume since not all mail servers will be configured to send with TLS if the remote server advertises the STARTTLS capability. Our CEO is also expressing some concerns regarding how often this feature would be leveraged in the average SmarterMail environment. He believes this is something that would only be enabled in very controlled environments that have an explicit need for TLS restrictions due to certain internal policies, regulatory compliance, etc.
In order for me to advocate on your behalf for this feature, do you mind providing me with a bit more information about your environment and why this setting would be implemented within your environment ?
Technical Support Supervisor