$sock = new HTTPSocket();
$sock->coect('ssl://localhost', 2222);
$sock->set_login(ADMIN_USERNAME, ADMIN_PASSWORD);	
$sock->set_method('POST');

$sock->query('/CMD_EMAIL_POP',
    array(
        'action'  => 'create',
        'domain'  => $domain,   // i.e. 'mydomain.com'
        'user'    => $useame, // i.e. 'john'
        'passwd'  => $password,
        'passwd2' => $password,
        'create'  => 'Create'
    )
);
$result = $sock->fetch_body();

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Thank you.

I'm no guru at this but it looks like for some reason the SNI is not working.

Try fixing your rDNS/PTR first, should be done anyway just to be sure.
Your ip is now pointing to the xx-xx-xx-hosted-by-worldstream.net and it shuold point to your hostname so ns1.liviupxxxx.eu if all is well.
Maybe that will fix things already for you.

Is there some solid solutions for DDOS attack with DA panel ? I wonder if DA could detect DDOS attack and then redirect user to static page (or enable Google ReCaptcha) instead loading index.php (with loading all CMS framework that going to server stuck) ?

It say to use this:

da build set webserver nginx
da build set php1_mode php-fpm
da build nginx
da build php
da build rewrite_confs

Also, I know how to install LEMP using SSH. Is doing it that way mean I miss out something compared to the way shown in the docs?