Configure Postfix to use Gmail as a Mail Relay on Fedora

Summary:

#dnf update && dnf install postfix cyrus-sasl cyrus-sasl-plain mailx

#vi /etc/postfix/sasl_passwd
[smtp.gmail.com]:587    username@gmail.com:password

#chmod 600 /etc/postfix/sasl_passwd

#vi /etc/postfix/main.cf

Add or modify the following values:

relayhost = [smtp.gmail.com]:587
smtp_use_tls = yes
smtp_sasl_auth_enable = yes
smtp_sasl_security_options =
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_tls_CAfile = /etc/ssl/certs/ca-bundle.crt

#postmap /etc/postfix/sasl_passwd

#systemctl restart postfix.service

https://myaccount.google.com/lesssecureapps

#mail -s "Subject Here" recipient@domain.com < textfile
or
#telnet localhost 25
mail from:
rcpt to: 
data
your_messages
.
quit

Troubleshooting:

journalctl -u postfix

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