Typically, SPAM can be triggered if the email is unintended and you can change that from her by associating her email as an address you accept.

As for Comcast, we see issues from comcast addresses from time to time here also. I'm not sure what they do, or intend to do, but they seem to operate differently than many other ISPs and it might not be the BTL routers fault at all. I know our issues with Comcast turned out to be something only they could change.

M. Sjulstad
M&M Trivia - JAMPT UP Band