 <p>Quick question: is the image the same every time or specific to a customer order? I presume it is different or you wouldn't be asking.</p> <p>To clarify: attachments are okay if you sending out invoices/delivery notes/order confirmation. However you are advised to setup your email so that the IP address can be verified directly. You are also advised to use a SPFrecord in your DNS so that the remote mail server can check that your server is allowed to send emails for you. Furthermore, in your order success page you can also ask your customers to add you to their address book, in that way your emails will not be marked as SPAM, regardless of whether you have SPF records and things setup. The only thing is you cannot guarantee customers will do that, so the SPF records and the IP reverse lookup is best. You can also use DomainKeys DKIM for the likes of Yahoo mail - mail delivery isn't what this question is about so you will have to Google DKIM for yourself...</p> <p>Otherwise, attaching an image is simple. See the example at the top of the page of the Zend Programmers Reference Guide on attachments:</p> <p><a href="http://framework.zend.com/manual/en/zend.mail.attachments.html" rel="nofollow">http://framework.zend.com/manual/en/zend.mail.attachments.html</a></p> <p>Keep reading the comments for clarification on how to get the image data included.</p> <p>Hope that helps!</p>