diff --git a/smtp.mail.inc b/smtp.mail.inc
--- a/smtp.mail.inc
+++ b/smtp.mail.inc
@@ -469,9 +469,12 @@

// Process mimemail attachments, which are prepared in mimemail_mail().
if (isset($message['params']['attachments'])) {
	foreach ($message['params']['attachments'] as $attachment) {
-		if (isset($attachment['filecontent'])) {
-			$mailer->AddStringAttachment($attachment['filecontent'], $attachment['filename'], 'base64', $attachment['filemime']);
			
+		if (isset($attachment->filecontent)) { 
+			$mailer->AddStringAttachment($attachment->filecontent, $attachment->filename, 'base64', $attachment->filemime);
		}
-		if (isset($attachment->filepath)) {
-			$filename = isset($attachment['filename']) ? $attachment['filename'] : basename($attachment['filepath']);
-			$filemime = isset($attachment['filemime']) ? $attachment['filemime'] : file_get_mimetype($attachment['filepath']);
-			$mailer->AddAttachment($attachment['filepath'], $filename, 'base64', $filemime);
+		if (isset($attachment->filepath)) {
+			$filename = isset($attachment->filename) ? $attachment->filename : basename($attachment->filepath);
+			$filemime = isset($attachment->filemime) ? $attachment->filemime : file_get_mimetype($attachment->filepath);
+			$mailer->AddAttachment($attachment->filepath, $filename, 'base64', $filemime);
		}
	}
}