Identify what Edition of Transportation Layer Security (TLS) your gadget supports by examining the gadget tutorial or with the vendor. If the machine or application would not support TLS 1.two or above, you have the next solutions: Use an on-premises email server (Exchange Server or some other SMTP server) https://office365smtpsetup33333.blogdigy.com/cloudflare-dns-server-an-overview-40486031