Untrusted TLS connection established to xxx

暗号化はできてるけど、信用されていない＞＜

# vi /etc/postfix/main.cf

smtp_tls_CAfile = /etc/pki/tls/cert.pem # ●これが抜けてた
smtp_tls_security_level = may
smtp_tls_loglevel = 1

$ systemctl restart postfix

よし🐱

Trusted TLS connection established to aspmx.l.google.com[xxx.xxx.xxx.xxx]:25: TL