Looking For Some Help

I’m looking some help regarding my fantasy baseball guide.  Let me explain:

I sell a fantasy baseball guide; it’s in Excel format.  To make it smaller, I make it into a .zip file.  So far, I have just been sending the guide to each customer as an email attachment (it’s about 1.2 MB currently).  I’ve used an email service called BlueTie that allows for this; it’s worked OK so far.

Each week, I re-send the Guide to all customers with updates included.  So it is a weekly mass email of a 1.2 MB file to each person.  Issues: 

1. Some people have trouble receiving attachments via email.
2. The cool features I can add to the guide are limited since I need the file size to be small if it’s sent as an attachment.
3. I like the idea of hosting the file somewhere as a password-protected download, but have no idea how to do this and whether it’s affordable.  I assume I’d have to pay for bandwidth.
4. Everything has worked OK so far using BlueTie. However, BlueTie made a fatal error this evening by sending more than 10 of the same email to every customer! How can I make sure this never happens again?

If you can help me solve these IT-type issues, please email me at mlbtraderumors@gmail.com with your ideas.  I’ll pay you for this project, should it become a project.  Thanks.