Proxmox Mail Gateway support TLS 1.2 & 1.3 ???

Hello forum,
my mail provider is Strato. I received an email today that Strato will support the "TLS 1.0 and 1.1" protocols more from June 1st, 2021. Only the TLS 1.2 and 1.3 protocols are supported. I use the Proxmox Mail Gateway via IMAP to retrieve my mails from various mailboxes and then forward them to my Strato mail accounts. I am assuming that the mail gateway supports TLS 1.2 or 1.3, or am I wrong?
Do you have to set the protocol version for TLS somewhere?

Thanks for your response...

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