Here is the situation. I have a web site on ispconfig which uses joomla and its form to email contact us form. The email address that is used is an alias. i.e. firstname.lastname@example.org
. I have updated the MX record locally to point to the external mail server. I have changed the "MailServer" drop down to "External Mail Server" on the option tab under site management.
When the application sends an email I want it to just simple lookup the MX record and then send off the email. Users and aliases are defined on the external mail server. I seem that postfix insists on doing a local resolution before sending.
How can I get ispconfig to send all emails to the external mail server without trying to do any resolution itself?