Mail server configuration on RHEL using gmail 



yum -y install postfix cyrus-sasl-plain mailx
vi /etc/postfix/main.cf
# Add below detail in bottom of main.cf file
relayhost = [smtp.gmail.com]:587
smtp_use_tls = yes
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
vi /etc/postfix/sasl_passwd
[smtp.gmail.com]:587 alertmailacc@gmail.com:app_password


chmod 600 /etc/postfix/sasl_passwd
postmap /etc/postfix/sasl_passwd
systemctl restart postfix

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