So, I've been keeping an eye on things again today. Overall, things look pretty good, and most spam is being blocked outright at the MTA and scored appropriately in SA if not.
I've been inspecting the X-Spam-Status headers for the handful of messages that do slip through and noticed that most of them lack any evidence of the BAYES_* tests. Here's one such header: No, score=3.115 tagged_above=-999 required=4.5 tests=[HK_NAME_FREE=1, HTML_MESSAGE=0.001, MIME_HTML_ONLY=0.723, PYZOR_CHECK=1.392, SPF_PASS=-0.001] autolearn=disabled The messages that were delivered just before and after this one do have evidence of BAYES_* tests, so, it's not as though something is completely broken. Are there any normal circumstances under which Bayes tests are not run? Do I need to turn debugging back on and wait until this happens again? Thanks for all the help, everyone! -Ben