spam black/white lists case sensitive?

[Remco Barendse]

I'm using MS 4.20-3 and noticed that some blacklisted mail is not being
tagged / filtered.

My spam blacklist is all in lowercase, whereas the sender's domain name
uses uppercase letters as well.

I have this in my blacklist file:
From:           @globalautoindustry.com         yes

The spammer is sending mail from @GlobalAutoIndustry.com

Are these lists case sensitive?