I have a new ISPConfig 3.2.9p1 virtualbox VM Ubuntu 22.04 server that haves several websites running and accessible, but need to setup the Postfix mail server to relay SMTP mail via Gmail servers using my gmail app user account. The app user is setup, but do not know where to configure this with ISPConfig 3.2.9p1 admin interface. I have read it is not wise to configure any postfix config files manually as this can break the server's functionality causing ISPConfig to lose control over these functions. I can connect to my ISPConfig mail server from an Evolution email client internally without issue. My public DNS host records for the domain(s) are all correct ( A, AAAA, MX, SOA, SPF, etc) and verified. Any help would be appreciated. The main purpose of this feature is for my websites that have custom contact forms using a PHP Mailer or any SMTP function use the 'localhost' SMTP server to relay outbound messages until this site gets a business ISP circuit that doesn't block inbound SMTP connections. I will also be setting up a hosted mail server with some provider in the future to accept inbound email messages but need to be able to relay outbound SMTP mail immediately. Any help or guidance would be MUCH APPRECIATED! Thank you!