Reverse E-Mail Blockage.....

[Eddie G. O'Connor Jr.]

Hello you Ferdorans! (FedorIANS?...) I have a question,.....now....we 
all know that there's ways to block unwanted email from your system 
using Message Filters, and they work by blocking a certain domain or 
email address and prevent them from hitting your Inbox, I would like to 
know if anyone knows of a way to filter your messages in a sort of 
"reverse" order.....in other words instead of me telling the Mail Filter 
Rule: Block anything with the email address of (ABC at 123) I would like it 
to be "Allow everything from (123 at ABC) and block "Everything Else"...how 
would one go about doing this using Fedora 20 and Thunderbird? Any help 
would be greatly appreciated


Thank You


EGO II