To make sure Gmail never filters as spam mail from a certain contact or domain:
To whitelist an entire domain (all mail from an address ending in "about.com", for example), just type the domain name or the domain name preceded by '@'. To whitelist "about.com", for instance, type "@about.com" (not including the quotation marks).
You do not have to create a separate filter for each address. Separate addresses with '|' in the From: field instead. To whitelist both "This email address is being protected from spambots. You need JavaScript enabled to view it." and "This email address is being protected from spambots. You need JavaScript enabled to view it.", enter "This email address is being protected from spambots. You need JavaScript enabled to view it.|This email address is being protected from spambots. You need JavaScript enabled to view it.", for example.