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