OpenCart - not sending emails (notifications or contact page)

Question

As far as I can tell, my mail settings are configured correctly but I\'m not receiving any emails, not through the contact form, nor for new customers or any orders that are

Answer 1

I tried every fix possible, bit none worked for me (I am hosted on Site5, on Webfaction it worked). I ended up rewriting the send() function in system/library/mail.php file using SwiftMailer I installed system/library/swiftmailer directory. My code is not complete, because it assumes authentication is always necessary, but this should be an easy fix.

public function send() {
    require_once(DIR_SYSTEM . 'library/swiftmailer/swift_required.php');

    if (!$this->to) {
        trigger_error('Error: E-Mail to required!');
        exit();         
    }

    if (!$this->from) {
        trigger_error('Error: E-Mail from required!');
        exit();                 
    }

    if (!$this->sender) {
        trigger_error('Error: E-Mail sender required!');
        exit();                 
    }

    if (!$this->subject) {
        trigger_error('Error: E-Mail subject required!');
        exit();                 
    }

    if ((!$this->text) && (!$this->html)) {
        trigger_error('Error: E-Mail message required!');
        exit();                 
    }

    if (is_array($this->to)) {
        $to = implode(',', $this->to);
    } else {
        $to = $this->to;
    }

    $message = Swift_Message::newInstance()
      ->setSubject($this->subject)
      ->setFrom(array($this->from => $this->sender))
      ->setTo(array($to))
      ->setBody($this->text);

    if($this->html){
        $message->addPart($this->html, 'text/html');
    }

    foreach ($this->attachments as $attachment) {
        if (file_exists($attachment)) {
            $message->attach(Swift_Attachment::fromPath($attachment));
        }
    }

    $transport = Swift_SmtpTransport::newInstance('localhost', 25)
    ->setUsername($this->username)
    ->setPassword($this->password);

    $mailer = Swift_Mailer::newInstance($transport);
    $mailer->send($message);
}