Where do you host that server? It might be that your provider blocks port 25 incoming and without port 25 incoming open, your server can not receive any emails.
No, or at least not without running another mail server anywhere else for the mailboxes with port 25 open to receive the emails which render your current mail server useless. I can just recommend to get a vm or root server in a datacenter that does not block ports which are required for the services that you want to host.
Okay already on it. Should I follow a partial tutorial for adding a mail server after already installing the web server? Thank you.
Just refer to your ISPConfig manual for multi server setup to build up and add up a mail server to your current setup. Also compare with the latest perfect server tutorial related to your OS. It should be straight forward.
Ok. I have setup the mail server many times now, each with different errors. Finally had it sending email but could not receive email without error 5.5.0 (dns stuff, but I could see it reaching the server). I restarted the tutorials. And have a new mail server running, now after creating the new Email domain and Mailbox in ISPConfig (with the new mail server as the server) Roundcube says "Connection to Storage server failed". This is for any domain. My config.inc.php (on the web server with roundcube) includes $config['default_host'] = 'mail.myserver.com'; and $config['smtp_server'] = 'mail.myserver.com'; Furthermore if we can fix this... should I be creating these emails such as, [email protected] (mail server) or from [email protected] (web server) or with [email protected] (CNAME example to mail.myserver.com)
Thanks for the reply. I can now receive emails, but cannot send "SMTP Error (-1): Connection to server failed." within roundcube. My config.inc.php and defaults.inc.php (on the web server with roundcube) include Code: $config['default_host'] = 'mail.myserver.com'; and Code: $config['smtp_server'] = 'mail.myserver.com'; and Code: $config['smtp_port'] = 25; I tried using an external client and get "TLS handshaking: SSL accept() failed:" in my mail.log
Test with telnet mail.myserver.com 25 why the connection failed. See for example this: https://mailtrap.io/blog/2016-07-26-how-to-test-smtp-server More similar instructions can be found with Internet Search Engines.
