$config = array(
            'protocol'=>'smtp',
            'smtp_host'=>'ssl://smtp.gmail.com',
            'smtp_port'=>465,
            'smtp_user'=>'username@gmail.com',
            'smtp_pass'=>'password',
            'mailtype'=>'text',
            'charset'=>'iso-8859-1',
            'smtp_timeout'=>'30',
            'crlf'=>'rn',
            'newline'=>'rn',
            'wordwrap'=>TRUE
        );
        $this->load->library('email',$config);

220 smtp.gmail.com ESMTP b36sm5736977edd.67 - gsmtp

hello: 250-smtp.gmail.com at your service, [86.180.98.185]
250-SIZE 35882577
250-8BITMIME
250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-CHUNKING
250 SMTPUTF8

Failed to authenticate password. Error: 535-5.7.8 Username and Password not accepted. Learn more at 535 5.7.8 https://support.google.com/mail/?p=BadCredentials b36sm5736977edd.67 - gsmtp
Unable to send email using PHP SMTP. Your server might not be configured to send mail using this method.

User-Agent: CodeIgniter
Date: Thu, 9 Nov 2017 10:22:00 +0000
From: "Mike Heath" <msheath@btinternet.com>
Return-Path: <msheath@btinternet.com>
To: mike24heath@gmail.com
Subject: =?ISO-8859-1?Q?=43=6F=6E=74=61=63=74=20=4D=65=73=73=61=67=65?=
Reply-To: <msheath@btinternet.com>
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X-Mailer: CodeIgniter
X-Priority: 3 (Normal)
Message-ID: <5a042c4818341@btinternet.com>
Mime-Version: 1.0


Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit