If you see this error message in your postfix logs
postfix/smtp[19417]: certificate verification failed for gmail-smtp-in.l.google.com[74.125.71.26]:25: untrusted issuer /C=US/O=Equifax/OU=Equifax Secure Certificate Authority
just add the following line in your /etc/postfix/main.cf
smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
and restart postfix
service postfix restart or systemctl restart postfix
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