Replace the opencart Mail class to send mixed part emails correctly with DKIM signature support.

Reduce the chance of your email ending up in your customers junk/spam folder by sending your emails via SMTP instead of php native mail() function with a valid DKIM signature.

More information about phpMailer: https://github.com/PHPMailer/PHPMailer

Install by:

Upload the extension using the Extension Installer

[list=2]Refresh Modifications and Clear any caching[/list]
[list=2]Go to store settings, click Mail tab and select PHPMailer as the mail settings. This will use your SMTP settings[/list]