PMG Block requests from and to

if you want to match from/to header, you have to use a 'what' object with 'match field'

but i don't think it's possible to directly create a rule that does what you want

you'd have to create multiple rules:

1: to : admin@example.com/spam@example.com, from: example3.com/example4.com -> ACCEPT
2: to : admin@example.com/spam@example.com -> BLOCK