If your email allows POP3, you can always set up a "Rule" and have those particular emails sent to a folder of it's own.

Or you can use the "mail forward" and  have the email from that address forwarded to an address you do use.  Mail forwarding doesn't contribute to spam because basically all you are doing is setting up an automatic mailing to yourself from a different address.

My email address for here is gmail and I it forwarded to my outlook express from my gmail. 

In my Outlook Express I have rules set up to funnel newsletters and gallery comments into their own folders. I also have a rule set up that automatically deletes mailings that contain certain words IE: Viagra! LOL

You can set up a rule to have the receipts put into a special folder of their own.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi