Sending mail via iredmail server?

Question

CodeIgniter

Hello. There is an ubuntu server with iredmail on it. All is well, letters are sent. But a question arose. How now on ANOTHER server to send mail through the iredmail server?
PS I use codeigniter.

$config['protocol'] = 'smtp';
    $config['smtp_host'] = 'mail.server.co';
    $config['smtp_user'] = 'email';
    $config['smtp_pass'] = 'pass';
    $config['smtp_port'] = '443';
    $config['charset'] = 'utf-8';
    $config['wordwrap'] = TRUE;

Answer 1

iredmail is some kind of garbage for those who do not know how to set up mail servers, as far as you can see from their site. In fact, postfix acts as an smtp server there. Here is a postfix and configure, read what a relay host is and everything else. Or, hire a specialist.