禁止使用代码点火器使用mailgun smtp发送邮件

我正在尝试使用codeigniter电子邮件库和mailgun smtp发送电子邮件。smtp设置配置正确，我不知道问题出在哪里。。。。

这是php代码：

$config['mailtype'] = 'html';
$config['charset'] = 'utf-8';
$config['protocol'] = 'smtp';
$config['smtp_host'] = 'smtp.mailgun.org';
$config['smtp_port'] = 25;
$config['smtp_user'] = 'user@user.com';
$config['smtp_pass'] = 'thepasswordconfiguredinmailgun';
$config['smtp_timeout'] = '4';
$config['crlf'] = ''n';
$config['newline'] = ''r'n';
$this->email->initialize($config);
$this->email->clear(TRUE);
$this->email->from('office@test.com', 'FromName');
$this->email->to('myemail@yahoo.com');
$this->email->subject('Subiect de test');
$this->email->message('Testez sa vad daca merge si daca pot sa trimit. Daca nu pot de ce nu pot ?');
$this->email->send();
echo $this->email->print_debugger();

我有以下错误：

The following SMTP error was encountered: 110 Connection timed out
Unable to send data: AUTH LOGIN
Failed to send AUTH LOGIN command. Error:
Unable to send data: MAIL FROM:
from: 
The following SMTP error was encountered:
Unable to send data: RCPT TO:
to: 
The following SMTP error was encountered:
Unable to send data: DATA
data: 
The following SMTP error was encountered:
Unable to send data: User-Agent: CodeIgniter Date: Fri, 13 May 2016 10:19:19 +0300 From: "PADigest" Return-Path: To: test123@yahoo.com Subject: =?utf-8?Q?Subiect_de_test?= Reply-To: "office@padiads.ro" X-Sender: office@padigest.ro X-Mailer: CodeIgniter X-Priority: 3 (Normal) Message-ID: <57357ff767c94@padiads.ro> Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="B_ALT_57357ff767d02" This is a multi-part message in MIME format. Your email application may not support this format. --B_ALT_57357ff767d02 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Testez sa vad daca merge si daca pot sa trimit. Daca nu pot de ce nu pot ? --B_ALT_57357ff767d02 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Testez sa vad daca merge si daca pot sa trimit. Daca nu pot de ce nu pot ? --B_ALT_57357ff767d02--
Unable to send data: .
The following SMTP error was encountered:
Unable to send email using PHP SMTP. Your server might not be configured to send mail using this method.
User-Agent: CodeIgniter
Date: Fri, 13 May 2016 10:19:19 +0300
From: "PADigest" <office@padiast.ro>
Return-Path: <office@padiasr.ro>
To: test124@yahoo.com
Subject: =?utf-8?Q?Subiect_de_test?=
Reply-To: "office@padiast.ro" <office@padiast.ro>
X-Sender: office@padiast.ro
X-Mailer: CodeIgniter
X-Priority: 3 (Normal)
Message-ID: <57357ff767c94@padigest.ro>
Mime-Version: 1.0

Content-Type: multipart/alternative; boundary="B_ALT_57357ff767d02"
This is a multi-part message in MIME format.
Your email application may not support this format.
--B_ALT_57357ff767d02
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Testez sa vad daca merge si daca pot sa trimit. Daca nu pot de ce nu pot ?

--B_ALT_57357ff767d02
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Testez sa vad daca merge si daca pot sa trimit. Daca nu pot de ce nu pot ?
--B_ALT_57357ff767d02--