Is there an e-mail merge facility, with an attachment, so you can set up multiple e-mails with personalised address attachments ?

I want to send multiple e-mails, one to each recipient, with a standard letter, but with a personalised greeting, attached. I want to set up the e-mail list and send them mout without having to do each e-mail separately. It would be like a mail merge except using e-mails with an attachment.