CodeIgniter无法发送邮件求助：附SMTP配置代码

Hey there! Let's figure out why your CodeIgniter setup isn't sending emails via Office365 SMTP. I've looked over your config, and here are the most common fixes and checks to run through:

1. Double-Check Your SMTP Credentials #

First things first:

• Make sure your smtp_user is your full Office365 email address (e.g., yourname@company.com), not just a username.
• If you have Multi-Factor Authentication (MFA) enabled on your Office365 account, your regular password won't work here. You'll need to generate an App Password from your Microsoft account settings and use that instead of your regular login password.
• Confirm with your Office365 admin that SMTP access is allowed for your account—some organizations block SMTP by default for security.

2. Complete Your Email Sending Code (and Enable Debugging) #

Your code cuts off at $this->ema..., so make sure you're using a full, valid sending flow. Most importantly, use CodeIgniter's built-in debugger to get specific error details—this is the fastest way to pinpoint the issue. Here's a complete example:

// Your existing config
$config = array();
$config['protocol'] = 'smtp';
$config['mailtype'] = 'text';
$config['charset']='utf-8';
$config['crlf']="\r\n";
$config['newline']="\r\n";
$config['priority']=3;
$config['smtp_host'] = 'smtp.office365.com';
$config['smtp_port']=587;
$config['smtp_crypto']="tls";
$config['smtp_user'] = 'your-full-office365-email@domain.com';
$config['smtp_pass'] = 'your-app-password-or-regular-password';
$config['smtp_timeout'] = 120;

$this->email->initialize($config);

// Set email details
$this->email->from('your-full-office365-email@domain.com', 'Your Display Name');
$this->email->to('recipient@example.com');
$this->email->subject('Test Email from CodeIgniter');
$this->email->message('This is a test message to verify SMTP setup.');

// Send and debug
if (!$this->email->send()) {
    // Print detailed error info
    echo $this->email->print_debugger();
} else {
    echo 'Email sent successfully!';
}

The print_debugger() output will tell you exactly what's wrong—whether it's a connection timeout, authentication failure, or something else.

3. Check Server/Network Restrictions #

• Port Access: Many web hosts block outbound connections on port 587 (common for SMTP). Contact your host to confirm that port 587 is open for outbound traffic to smtp.office365.com.
• Firewall Rules: If you're running your own server, make sure your firewall isn't blocking outgoing connections to Office365's SMTP server. You can test connectivity manually with this command (run it on your server):

  telnet smtp.office365.com 587
  

  If you get a "Connection refused" or timeout, the issue is definitely network-related.

4. Verify CodeIgniter Version Compatibility #

If you're using an older version of CodeIgniter (like 2.x), there are known bugs with SMTP TLS handling that can break connections to Office365. Consider upgrading to the latest stable version (3.x or 4.x) if possible—this often resolves compatibility issues.

5. Confirm CRLF/Newline Settings #

You already have crlf and newline set to "\r\n", which is correct (SMTP requires CRLF line endings). Just double-check that you're using double quotes here—single quotes would treat \r\n as literal text, which would cause problems. Your config looks good on this front, but it's worth a quick check.

Once you run the debug code, share the error message you get, and we can narrow it down further!

内容的提问来源于stack exchange，提问作者Akash lal