I just install ISP Config 3 on Centos. We use google mail service (MX records point to google mail servers). So... how to configure ISPConfig to "send mail" to another server? When sending email sendmail look users on localhost and return error "user do not exists".
1) do not craete a email domain for this domain that you redirected to google. 2) Make sure that you did not use the same domain os hostname or in postfix main.cf
