Attachments Files can be attached to an e-mail using the createAttachment() method. The default behavior of Zend_Mail is to assume the attachment is a binary object (application/octet-stream), that it should be transferred with base64 encoding, and that it is handled as an attachment. These assumptions can be overridden by passing more parameters to createAttachment(): E-Mail Messages with Attachments createAttachment($someBinaryString); $mail->createAttachment($myImage, 'image/gif', Zend_Mime::DISPOSITION_INLINE, Zend_Mime::ENCODING_BASE64); ]]> If you want more control over the MIME part generated for this attachment you can use the return value of createAttachment() to modify its attributes. The createAttachment() method returns a Zend_Mime_Part object: createAttachment($myImage); $at->type = 'image/gif'; $at->disposition = Zend_Mime::DISPOSITION_INLINE; $at->encoding = Zend_Mime::ENCODING_BASE64; $at->filename = 'test.gif'; $mail->send(); ]]> An alternative is to create an instance of Zend_Mime_Part and add it with addAttachment(): type = 'image/gif'; $at->disposition = Zend_Mime::DISPOSITION_INLINE; $at->encoding = Zend_Mime::ENCODING_BASE64; $at->filename = 'test.gif'; $mail->addAttachment($at); $mail->send(); ]]>