signing gmail with php imap

Question

My code

$headers  = 'MIME-Version: 1.0' . PHP_EOL;
$headers .= 'Content-type: text/html; charset=iso-8859-1' . PHP_EOL;
$headers .= 'From: Me <[e-mail]>' . PHP_EOL;
imap_mail('[e-mail]','test',"$output","$headers");

Is there a way to sign the mail? when I use above code to test sending emails, I receive the email but I am getting the error

This message may not have been sent by: [e-mail]  Learn more  Report phishing

according to gmail they attach signed data to the headers to authenticate

I am using gmail imap to send the mails

$inbox = imap_open($hostname,$username,$password)
          or die('Cannot connect to Gmail: ' . imap_last_error());

Is there a way to authenticate the email using php imap?

Answer 1

If you want to send mails as a Gmail user I recommend using the Gmail's SMTP. As IMAP is mainly used to receive mails from the inbox.

Here's how to send mails from Gmail's SMTP.

First

• Make sure the PEAR Mail package is installed.
  • Typically, in particular with PHP 4 or later, this will have already been done for you. Just give it a try. (Mail.php)

Then

Sending Mail from PHP Using SMTP Authentication - Example

<?php
 require_once "Mail.php";

 $from = "Sender <[e-mail]>";
 $to = "Recipient <[e-mail]>";
 $subject = "Hi!";
 $body = "Hi,\n\nHow are you?";

 $host = "smtp.gmail.com";
 $username = "[e-mail]";
 $password = "Gmail Password";

 $headers = array ('From' => $from,
   'To' => $to,
   'Subject' => $subject);
 $smtp = Mail::factory('smtp',
   array ('host' => $host,
     'auth' => true,
     'username' => $username,
     'password' => $password));

 $mail = $smtp->send($to, $headers, $body);

 if (PEAR::isError($mail)) {
   echo("<p>" . $mail->getMessage() . "</p>");
  } else {
   echo("<p>Message successfully sent!</p>");
  }
 ?>

Sending Mail from PHP Using SMTP Authentication and SSL Encryption - Example

<?php
 require_once "Mail.php";

 $from = "Sender <[e-mail]>";
 $to = "Recipient <[e-mail]>";
 $subject = "Hi!";
 $body = "Hi,\n\nHow are you?";

 $host = "ssl://smtp.gmail.com";
 $port = "465";
 $username = "[e-mail]";
 $password = "Gmail Password";

 $headers = array ('From' => $from,
   'To' => $to,
   'Subject' => $subject);
 $smtp = Mail::factory('smtp',
   array ('host' => $host,
     'port' => $port,
     'auth' => true,
     'username' => $username,
     'password' => $password));

 $mail = $smtp->send($to, $headers, $body);

 if (PEAR::isError($mail)) {
   echo("<p>" . $mail->getMessage() . "</p>");
  } else {
   echo("<p>Message successfully sent!</p>");
  }
 ?>

Source about.com