Can CF block specific email servers?

I would like to prevent Russian email servers from being able to send email from my CF protected sites.

One such server is

Is there a setting to do this in CF? Thank you.

What do you mean

As i know, mail was send from your server, or your smtp server, not send via (unless you are using smtp)

Ah, yes, you are correct. Thank you. I will need to do it in .htaccess

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