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//$this->Host = "server hostname";     //THis WORKS
    //$this->Host = "account domain"; // this WORKS
    $this->Host = "localhost";  // this FAILS
    $this->SMTPAuth = true; // Only works on non-localhost Host.
    //$this->Port = 25; //default.
    $this->Username = 'email_Address@accountdomain.com';
    $this->Password = '...!...';

2016-11-24 14:40:52 Connection: opening to localhost:25, timeout=20, options=array (
                                      )
2016-11-24 14:40:52 Connection: opened
2016-11-24 14:40:52 SMTP -> get_lines(): $data is ""
2016-11-24 14:40:52 SMTP -> get_lines(): $str is  "220-serverdomain.com ESMTP Exim 4.87  #1 Thu, 24 Nov 2016 14:40:52 +0000
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $data is "220-serverdomain.com ESMTP Exim 4.87  #1 Thu, 24 Nov 2016 14:40:52 +0000
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $str is  "220-   We do not authorize the use of this system to transport unsolicited,
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $data is "220-serverdomain.com ESMTP Exim 4.87  #1 Thu, 24 Nov 2016 14:40:52 +0000
                                      220-   We do not authorize the use of this system to transport unsolicited,
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $str is  "220    and/or bulk e-mail.
                                      "
2016-11-24 14:40:52 SERVER -> CLIENT: 220-serverdomain.com ESMTP Exim 4.87  #1 Thu, 24 Nov 2016 14:40:52 +0000
                                      220-   We do not authorize the use of this system to transport unsolicited,
                                      220    and/or bulk e-mail.
2016-11-24 14:40:52 CLIENT -> SERVER: EHLO www.accountdomain.co.uk
2016-11-24 14:40:52 SMTP -> get_lines(): $data is ""
2016-11-24 14:40:52 SMTP -> get_lines(): $str is  "250-serverdomain.com Hello www.accountdomain.co.uk [::1]
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $data is "250-serverdomain.com Hello www.accountdomain.co.uk [::1]
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $str is  "250-SIZE 52428800
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $data is "250-serverdomain.com Hello www.accountdomain.co.uk [::1]
                                      250-SIZE 52428800
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $str is  "250-8BITMIME
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $data is "250-serverdomain.com Hello www.accountdomain.co.uk [::1]
                                      250-SIZE 52428800
                                      250-8BITMIME
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $str is  "250-PIPELINING
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $data is "250-serverdomain.com Hello www.accountdomain.co.uk [::1]
                                      250-SIZE 52428800
                                      250-8BITMIME
                                      250-PIPELINING
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $str is  "250-AUTH PLAIN LOGIN
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $data is "250-serverdomain.com Hello www.accountdomain.co.uk [::1]
                                      250-SIZE 52428800
                                      250-8BITMIME
                                      250-PIPELINING
                                      250-AUTH PLAIN LOGIN
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $str is  "250-STARTTLS
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $data is "250-serverdomain.com Hello www.accountdomain.co.uk [::1]
                                      250-SIZE 52428800
                                      250-8BITMIME
                                      250-PIPELINING
                                      250-AUTH PLAIN LOGIN
                                      250-STARTTLS
                                      "
2016-11-24 14:40:52 SMTP -> get_lines(): $str is  "250 HELP
                                      "
2016-11-24 14:40:52 SERVER -> CLIENT: 250-serverdomain.com Hello www.accountdomain.co.uk [::1]
                                      250-SIZE 52428800
                                      250-8BITMIME
                                      250-PIPELINING
                                      250-AUTH PLAIN LOGIN
                                      250-STARTTLS
                                      250 HELP
2016-11-24 14:40:52 CLIENT -> SERVER: STARTTLS
2016-11-24 14:40:52 SMTP -> get_lines(): $data is ""
2016-11-24 14:40:52 SMTP -> get_lines(): $str is  "220 TLS go ahead
                                      "
2016-11-24 14:40:52 SERVER -> CLIENT: 220 TLS go ahead
2016-11-24 14:40:52 SMTP Error: Could not connect to SMTP host.
2016-11-24 14:40:52 CLIENT -> SERVER: QUIT
2016-11-24 14:40:52 SMTP -> get_lines(): $data is ""
2016-11-24 14:40:52 SMTP -> get_lines(): $str is  "221 serverdomain.com closing connection
                                      "
2016-11-24 14:40:52 SERVER -> CLIENT: 221 serverdomain.com closing connection
2016-11-24 14:40:52 Connection: closed
2016-11-24 14:40:52 SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting