I have tried several times to send an attachment using simple mail. I have tried sending Word documents and PDF documents and neither will open when the recipient receives them. When I try to send an email with an attachment to my hotmail account, which doesn't go through simple mail, I receive the following when I try to open the attachment.

Server not found

Firefox can't find the server at 1351311760981%40simplemail.

Check the address for typing errors such as
ww.example.com instead of
www.example.com