Email filters

I've been adding to the filters for every email that is from domains that I have found to be "untrusted". The filter is set to delete the email. The number of filter entries is getting large. 

Is it possible to:

• Have a filter output to a text file (or similar) so I can see which ones have been deleted?
• Add a list of these domains/email addresses to disregard instead of adding a new filter entry each time?

Thanks,

Eddy