Send attachments?
- you're consuming bandwidth- recipients may not be allowed to receive attachments
- recipients may block some type of attachments
- if a recipient's mailbox is nearly full, it may be that you're email cannot be delivered because it is too big
and most of all - you do not generate traffic to your site.
I think it is better to create a link to the attachment itself, or a webpage where the attachment can be downloaded. Doing it via the second option can have the effect that visitors may view other pages on your website as well, and not only the attachment.

