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How to disable TLS v1.0 in FortiMail

By: Author Alex Lim

Posted on

Categories Troubleshooting

This article describes how to disable TLS v1.0.

Scope

FortiMail.

Solution

The example below is to disable the TLS v1.0 on FortiMail. It will disable the TLS v1.0 for the HTTPS and SMTP access to FortiMail.

Run the CLI command below to disable the TLS v1.0:

config system global
set ssl-versions tls1_1 tls1_2 tls1_3
end

Note: If there is any sender that can only support TLS v1.0, they might be having an issue sending email to FortiMail or will need to send it using plain text.