I would like to see some additional options within exceptions area of spamBlocker beyond just sender & recipient. For starters, being able to specify e-mail headers to allow or deny would be nice added capability.
You can deny things in the SMTP headers already, using the SMTP proxy.
Normally this is done using RegEx.
The deny would happen prior to the e-mail being identified as spam.
There is an example, here:https://community.watchguard.com/watchguard-community/discussion/comment/1976
Thanks Bruce, I realize that I can deny that way, but I can't come up with a reasonable way to allow (aka whitelist) that way.