Php – Mail sent but not received, codeigniter

Since we found the answer to your issue in the comments, it seemed prudent to write up an answer.

The problem was that your weren't doing anything with your email configuration array ($email_config). While you may or may not have had the right settings defined there, they meant nothing as they were not used properly.

Thus, at the very least, you must change your code to reflect the following changes:

$email_config = Array(
    'protocol'  => 'smtp',
    'smtp_host' => 'ssl://smtp.googlemail.com',
    'smtp_port' => '465',
    'smtp_user' => 'app123testing@gmail.com',
    'smtp_pass' => 'apptesting',
    'mailtype'  => 'html',
    'starttls'  => true,
    'newline'   => "\r\n"
);

$this->load->library('email', $email_config);

Please note that this will merely fix the issue with your approach, I cannot verify the credibility of your settings/access credentials.

EDIT:

As per jtheman's suggestion I decided to dig a bit deeper. You may want to look at this https://stackoverflow.com/a/17274496/2788532.

EDIT #2:

You can access useful error messages from CI's email class by using the following code (after you attempt to send an email, of course):

<?php echo $this->email->print_debugger(); ?>

In Codeigniter, Try this

$this->load->library('email');
$config['protocol']='smtp';
$config['smtp_host']='your host';
$config['smtp_port']='465';
$config['smtp_timeout']='30';
$config['smtp_user']='your mail id';
$config['smtp_pass']='your password';
$config['charset']='utf-8';
$config['newline']="\r\n";
$config['wordwrap'] = TRUE;
$config['mailtype'] = 'html';
$this->email->initialize($config);
$this->email->from('no-reply@your-site.com', 'Site name');
$this->email->to('to-address-mail-id');
$this->email->subject('Notification Mail');
$this->email->message('Your message');
$this->email->send();

In $config['smtp_user'] field,give your email_id and in $config['smtp_pass'] field,provide your password for that mail.

This will work.Just try it. Hope this will solve your problem.