JTN Spam Filtering

[#1]

http://servicestatus.net/index?id=832
What will happen to email that the new spam filters think is spam? Will it get forwarded and tagged or silently dumped because JTN simply acts as a routing/forwaring service there isn't a spam account for spam to end up in.
Edited to add that as I run SMTP forwarding most of my email usually gets delivered directly to my server rather than going via the PN email servers so do I need to set up anything on my server to catch incoming identified spam?

[#2]

I could probably have worded that better TBH.
Forwarded email is already being passed through a spam filtering solution however due to the nature of these sorts of services some of the messages are getting greylisted - resulting in this problem.
The maintenance work you've linked to is to stop this happening.
For the record, email identified as spam would be rejected.

[#3]

Bob
What do we do if we think we have email going out via PN to JTN and back into PN which is being lost somewhere along the line?