When I send a message with a string attachment, the string attachment when opened only gives a 1 and in the email sorce it says
--b1_5a1a74831dfa0ce86353d222b95078c6
Content-Type: text/html; name="apperley-invoice-20017.html"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="apperley-invoice-20017.html"
MQ==
--b1_5a1a74831dfa0ce86353d222b95078c6--
Im using this code to add the attachment:
$mail->AddStringAttachment($invoicehtml,$filename,'base64','text/html');