hMailServer and Roundcube

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Hi,

Please help me to answer the question because I confused myself now.
I use hMailServer and Roundcube.
How it's actually work?
I set roundcube config file to use secure connection:

PHP:

$rcmail_config['default_host'] = 'ssl://domain.com';
$rcmail_config['default_port'] = 993;  

PHP:

$rcmail_config['smtp_server'] = 'ssl://domain.com';
$rcmail_config['smtp_port'] = 465;  

- but I still can connect/send emails even if I disable these ports on the firewall?

I tested and when I changed these settings to not use secure connection I couldn't connect to the server so that means everything's fine with the mail server itself as it requires SSL.

I think that I can connect even if these ports are disabled on the firewall because web server=>roundcube and mail server are installed on the same machine? Am I right?

In addition I cannot connect with Thunderbird when these ports are disabled, I also couldn't find anything (password in plain text) with Wireshark when I log on to the Roundcube so looks like secure channel works?!