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Disable TLS 1.1 for SMTP / EMail

CiG

Hello everybody,

i have recently deployed a Sophos XG Firewall SFV4C6 (SFOS 18.0.0 GA-Build354.HF051220.1).

I am facing a problem with SMTP TLS configuration. There is an option to "Disable legacy TLS protocols" which disables everything older than TLS 1.1. Our government (as well as company) policy states that TLS 1.1 must be deactivated as well.
Is there a (hidden) option to deactivate TLS 1.1? Maybe even manage which ciphers are ok? 
I am aware that some mails will not be sent or received if it is configured this way.

Thanks in advance and kind regards,

Marco



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