Question Postfix Geoblocking

[shopuser]

How i can block postfix with geoblocking ?

i have installed geoblocking for the website and word very good:

How to block or whitelist specific countries through Plesk?

Applicable to: Plesk for Linux Plesk for Windows Question How to block specific countries in Plesk? Answer Such a feature is not implemented in Plesk yet.Vote for this feature on the UserVoice p...

support.plesk.com

but i have nonstop scanning hacking attacks against my mailserver the most comes from BR,CN,RU

example :
Dec 15 10:24:09 server postfix/smtpd[1539157]: connect from unknown[212.160.90.34]
Dec 15 10:24:11 server plesk_saslauthd[1539255]: listen=6, status=5, dbpath='/plesk/passwd.db', keypath='/plesk/passwd_db_key', chroot=1, unprivileged=1
Dec 15 10:24:11 server plesk_saslauthd[1539255]: privileges set to (110:116) (effective 110:116)
Dec 15 10:24:11 server plesk_saslauthd[1539255]: No such user 'abuse@xxx .de' in mail authorization database
Dec 15 10:24:11 server plesk_saslauthd[1539255]: failed mail authentication attempt for user 'abuse@xxx .de' (password len=7)
Dec 15 10:24:11 server postfix/smtpd[1539157]: warning: unknown[212.160.90.34]: SASL LOGIN authentication failed: authentication failure