Hello,

After upgrading our SmarterMail server to Build 9777, our Outlook clients can no longer connect. Outlook displays this error: “Your server does not support the connection encryption type you have specified. Try changing encryption method. Contact your mail server administrator or Internet service provider (ISP)."

I noticed the Build 9777 release notes mention a fix for secure connections serving an incomplete SSL/TLS certificate chain. Could this be related to the issue?

Could you advise what to check on the SmarterMail server and in Outlook? I can provide more details about our configuration, including the protocol, ports, and certificate, if needed.

Thank you.