https://linode.com/docs/email/postfix/postfix-smtp-debian7/ https://linode.com/docs/email/postfix/postfix-smtp-debian7/ Decent tutorial on setting up Postfix as a relay Decent tutorial on setting up Postfix as a relay https://linode.com/docs/email/postfix/postfix-smtp-debian7/ https://linode.com/docs/email/postfix/postfix-smtp-debian7/ https://linode.com/docs/email/postfix/postfix-smtp-debian7/ Decent tutorial on setting up Postfix as a relay SMTP Relay Configuration for Postfix Based System