Yes you can, but it depends on the MTA you are using.
In postfix it could be done with a config like this:
/etc/postfix/main.cf[1]:
smtpd_tls_security_level[2] = encrypt
But you will loose legitimate e-mails.
Regards
Dominik
Am Donnerstag, 18. Juli 2024, 14:36:09 CEST schrieb Jeff Pang via mailop:
> Can I setup mailserver to accept messages via sdl/tls only from other
> MTA? How to disable peer MTA send me plaintext mail?
>
> Thanks
>
>
--------
[1] https://www.postfix.org/postconf.5.html
[2] https://www.postfix.org/postconf.5.html#smtpd_tls_security_level
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