You need to check your hostname, also you can set:
vim /etc/postfix/main.cf
myhostname = myhostname = virtual.domain.tld
service postfix restart
Helo command rejected: Host not found (in reply to DATA postfix
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You need to check your hostname, also you can set:
vim /etc/postfix/main.cf
myhostname = myhostname = virtual.domain.tld
service postfix restart