Best way to include attachments using EmailService [Craft Plugin]?
In craft/app/models/EmailModel.php the function docblock describes the params:

/**
 * Adds an attachment from a path on the filesystem. Returns false if the file could not be found or accessed.
 *
 * @param string $path Path to the attachment.
 * @param string $name Overrides the attachment name.
 * @param string $encoding File encoding (see $Encoding).
 * @param string $type File extension (MIME) type.
 * @throws phpmailerException
 * @return bool
 */
public function addAttachment($path, $name = '', $encoding = 'base64', $type = 'application/octet-stream')
{
    $existingAttachments = $this-&gt;attachments;
    $existingAttachments[] = array('path' =&gt; $path, 'name' =&gt; $name, 'encoding' =&gt; $encoding, 'type' =&gt; $type);
    $this-&gt;attachments = $existingAttachments;
}


Is that what you're looking for?