Hello, I have a little doubt about my debian multiserver configuration. Web Server Db Server Mail Server (postfix installed and configured) Web Server 2 In order to avoid many MTA installed in the servers I have seen that ISPConfig has a specific section for the Relayhost. Can I use the SMTP external server in order to send all the ISPConfig mail system messages ? Have I to configure it with a SMTP account, in this section ? Thanks
I would not use the ISPConfig settings for this as this would require a complete ispconfig mails etup on the other nodes. Insteadof that, just install a minimal postfix system on the other nodes, then set relayhost of all nodes except of the mail node to the hostname of the mail node and on the mail node, add the IP addresses of all other nodes in the mynetworks line. That way, all other nodes are relaying their email messages trough the mail server and they don't have to authenticate there.
Hi Till, thanks for the clarification but in this case the website scripts could use the mail server to spam, or not? thanks
Maybe you can enforce that the website owners 'Contact Us' forms use SMTP instead of PHP and disable PHP mailer for the websites.
If you want a single MTA to send mail, i would use Till's soulution. I usually did not store all IPs from mynetworks in the main.cf. I have mynetworks = $config_directory/mynetworks and in /etc/postfix/mynetworks: 127.0.0.0/8 [::1]/128 192.168.0.0/24 A single file is a little bit easier to maintain.
