Enhancement Request: Sender Whitelist
It seems like it would be good to have an option to whitelist certain senders as opposed to just source IP and recipients. For example, if there are specific hotmail addresses you want to allow through without greylisting, but you don't want to let the entire domain through.
I also would like to be able to white-list by sender email address.
+1 for this
The reason this was originally not implemented was that the sender address is easy to spoof. Note that you can still achieve the same effect easily by whitelisting the sender addresses on postfix-side, so that postfix doesn't send the request to postgrey.
I don't plan to implement this, except maybe if somebody submits a patch.