我正在尝试使用CodeIgniter和 outlook.com 发送电子邮件（使用XAMPP）。
使用Codeigniter和 Gmail 发送电子邮件效果很好，使用以下$config规范：
$config = array(
'mailtype' => 'html'
'protocol' => 'smtp',
'smtp_host' => 'ssl://smtp.googlemail.com',
'smtp_port' => 465,
'smtp_user' => '******@gmail.com',
'smtp_pass' => '******'
);
但是，应用以下 outlook.com 配置规范会导致出现错误消息（请参阅下文）：
$config = array(
'mailtype' => 'html'
'protocol' => 'smtp',
'smtp_host' => 'ssl://smtp.live.com',
'smtp_port' => 587,
'smtp_user' => '******@outlook.com',
'smtp_pass' => '******'
);
错误：
A PHP Error was encountered
Severity: Warning
Message: fsockopen(): SSL operation failed with code 1. OpenSSL Error messages: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol
Filename: libraries/Email.php
Line Number: 1689
A PHP Error was encountered
Severity: Warning
Message: fsockopen(): Failed to enable crypto
Filename: libraries/Email.php
Line Number: 1689
A PHP Error was encountered
Severity: Warning
Message: fsockopen(): unable to connect to ssl://smtp.live.com:587 (Unknown error)
Filename: libraries/Email.php
Line Number: 1689
A PHP Error was encountered
Severity: Warning
Message: fwrite() expects parameter 1 to be resource, boolean given
Filename: libraries/Email.php
Line Number: 1846
A PHP Error was encountered
Severity: Warning
Message: fgets() expects parameter 1 to be resource, boolean given
Filename: libraries/Email.php
Line Number: 1869
A PHP Error was encountered
Severity: Warning
Message: fwrite() expects parameter 1 to be resource, boolean given
Filename: libraries/Email.php
Line Number: 1846
A PHP Error was encountered
Severity: Warning
Message: fgets() expects parameter 1 to be resource, boolean given
Filename: libraries/Email.php
Line Number: 1869
A PHP Error was encountered
Severity: Warning
Message: fwrite() expects parameter 1 to be resource, boolean given
Filename: libraries/Email.php
Line Number: 1846
A PHP Error was encountered
Severity: Warning
Message: fgets() expects parameter 1 to be resource, boolean given
Filename: libraries/Email.php
Line Number: 1869
A PHP Error was encountered
Severity: Warning
Message: fwrite() expects parameter 1 to be resource, boolean given
Filename: libraries/Email.php
Line Number: 1846
A PHP Error was encountered
Severity: Warning
Message: fgets() expects parameter 1 to be resource, boolean given
Filename: libraries/Email.php
Line Number: 1869
A PHP Error was encountered
Severity: Warning
Message: fwrite() expects parameter 1 to be resource, boolean given
Filename: libraries/Email.php
Line Number: 1846
A PHP Error was encountered
Severity: Warning
Message: fgets() expects parameter 1 to be resource, boolean given
Filename: libraries/Email.php
Line Number: 1869
A PHP Error was encountered
Severity: Warning
Message: fwrite() expects parameter 1 to be resource, boolean given
Filename: libraries/Email.php
Line Number: 1846
A PHP Error was encountered
Severity: Warning
Message: fwrite() expects parameter 1 to be resource, boolean given
Filename: libraries/Email.php
Line Number: 1846
A PHP Error was encountered
Severity: Warning
Message: fgets() expects parameter 1 to be resource, boolean given
Filename: libraries/Email.php
Line Number: 1869
Replacing 'smtp_host' => 'ssl://smtp.live.com' with 'tls://smtp.live.com' results in the following error messages:
A PHP Error was encountered
Severity: Warning
Message: fsockopen(): SSL operation failed with code 1. OpenSSL Error messages: error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version number
Filename: libraries/Email.php
Line Number: 1689
[etc.]
问题： 我需要应用哪些规范才能使Codeigniter Email与outlook.com一起使用？