PHP SwiftMailer Failed to authenticate on SMTP server

Question

I am trying to create a test site that handles paypal payment. I am trying to send users an email using PHP SwiftMailer after a successful payment (which is my IPN).

Here is my code for the transport:

        $transport = Swift_SmtpTransport::newInstance('smtp.googlemail.com', 465, 'ssl')
          ->setUsername('[email protected]')
          ->setPassword('xxxx');    

    $mailer = Swift_Mailer::newInstance($transport);

I have tried to use googlemail and another email which is hosted under a shared server and both have problems giving out an error.

Unfortunately, I am getting this usual error:

  Fatal error: Uncaught exception 'Swift_TransportException' with message 'Failed to authenticate on SMTP server with username "[email protected]" using 2 possible authenticators' in /home/xxx/public_html/paypal/lib/classes/Swift/Transport/Esmtp/AuthHandler.php:184 

  Stack trace: 

  #0 /home/xxx/public_html/paypal/lib/classes/Swift/Transport/EsmtpTransport.php(312): Swift_Transport_Esmtp_AuthHandler->afterEhlo(Object(Swift_SmtpTransport)) 

  #1 /home/xxx/public_html/paypal/lib/classes/Swift/Transport/AbstractSmtpTransport.php(120): Swift_Transport_EsmtpTransport->_doHeloCommand() 

  #2 /home/xxx/public_html/paypal/lib/classes/Swift/Mailer.php(80): Swift_Transport_AbstractSmtpTransport->start() 

  #3 /home/xxx/public_html/paypal/ipn.php(113): Swift_Mailer->send(Object(Swift_Message)) 

  #4 /home/mctikudo/public_html/paypal/ipn.php(46): sendMail(Resource id #3, Array) 

  #5 {main} thrown in /home/xxx/public_html/paypal/lib/classes/Swift/Transport/Esmtp/AuthHandler.php on line 184

I have done some research and tried several approach in the setting of my transport. But still nothing seems to work. Until I just tried to place my IPN code to another server under another hosting company and surprisingly, it works. Same code from the other one.

This is why I guess there is something in the other server must be set or something.

Are there things that I need to make sure that is enabled on my server to have the SwiftMailer work?

Answer 1

This might be old but somebody might get help through this. I too faced the same problem and received a mail on my gmail account stating that someone is trying to hack your account through an email client or a different site. THen I searched and found that doing below would resolve this issue.

Go to https://accounts.google.com/UnlockCaptcha‎ and unlock your account for access through other media/sites.

UPDATE : 2015

Also, you can try this, Go to https://myaccount.google.com/security#connectedapps At the bottom, towards right there is an option "Allow less secure apps". If it is "OFF", turn it on by sliding the button.

Answer 2

As already stated this might be old but you can try and allow gmail to send mails through less secure apps.

https://www.google.com/settings/security/lesssecureapps

This made it work for me and I had the same issue.