We have received reports from our users that the Spam Score tab in an email blast won't connect to SpamAssassin. This seems to only occur for specific email blasts. Newer email blasts don't seem to be producing the error.
Update - it looks like this may be related to having hyperlinks in certain email blasts. If you can create this in your nation please let us know so we can continue to investigate!
Thanks Alex - any examples you have would be helpful in searching for a root cause. I'm unable to recreate this issue in my most current email blast.