Comcast "Filter Rules" Questions

Hi and Happy New Year,

I have two questions about the filter rules.

1) is there a limit to the number of domain names we can "redirect."?     I've been using the filter to redirect spam emails to a garbage email address and it works pretty well.   Each week I have to add more spam email domain names and I was wondering if there was a limit?

2)To those of you who use the filters.    Do you find Comcast occasionally 'misses' a redirect?   Every couple of days a domain name that I've listed shows up in my regular mailbox.  I was wondering if it was just me.

Thanks!!!!