Configuring postfix for email relay

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Install any prerequisite

yum install postfix cyrus-sasl cyrus-sasl-gssapi cyrus-sasl-plain

In main.cf add the following:

relayhost = <your relay host>:587
smtp_use_tls = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_auth_enable = yes
smtp_sasl_security_options =

in sasl_passwd

<your relay host>:587 username:password

Don't forget to postmap the sasl_passwd