I think having an automated way to "unmark spam" for a domain, rather than just per user, would be a good feature ... especially for corporate users that use SM
For the spam service we all know that anything in your junk folder can be "unmarked as spam" and this adds the address to the trusted senders list for your account. However, it doesn't add it to the trusted sender's list for your domain.
In our business, most of the staff deals with the same companies and potential suppliers etc on a daily basis ... much of this via email. I have also had this request from a number of clients that use our mail server for email. I don't want to start lowering thresholds for spam detection because, quite honestly, we get good results with actual spam ... but we also see a number of false positives.
Time is a precious resource and everyone taking the time to log into the web interface to see if something was zapped by the AS system is consuming, especially if everyone has to do it for their individual accounts.
While this may not be a great addition for the "general user", and I could see where that may cause headaches for general ISPs that use SM for very larger numbers of individual subscribers, I think it would be a very good addition to the Domain Administrator's Action Menu ... a command where they can choose "Unmark as Spam for Domain" and/or "Mark Domain Safe for Domain". This would add the address or domain to the domain's trusted sender list rather than the individual account's list, automatically ensuring that all future emails from said user/domain to anyone in the company would pass through unharmed.
While I realize there is a place to apply this already, it has to be done manually by the domain admin, not automatically... and only if they really understand how and where to do it. Having it on the Action Menu would make the process seamless and very intuitive for pretty much any user. Sometimes the people in charge of each domain have very little understanding about how anything really works or how to fix it manually, so intuitiveness is alwys a good thing.
Right now, users spend too much time having to check individual accounts for false positives.
JMO