Is it just me or have others seen a huge uptick in SPAM that is getting past the SPAM filter? So many of them are so obviously SPAM, it makes me wonder if the filter is not even working anymore.
If you haven't done so already, I'd suggest reporting your missed spam via the procedures here:
(Report False Positives or Missed Spam)https://www.watchguard.com/help/docs/help-center/en-US/Content/en-US/Fireware/services/spamblocker/spam_report_false_c.html
They involve forwarding the original message as an attachment to one of several email addresses that depend on the version of fireware you're running. If the spamblocker is mising spam, we can adjust the definitions to help correct that.
The traffic every mail server sees is a bit different, so one endpoint may be seeing a surge in spam, while others will seem completely normal.
WatchGuard Customer Support