Upon investigation, TrendAI™ determined that the recently released Anti-Spam Engine pattern version 27126.006 caused the engine in certain products to crash, which resulted in deferred or delayed emails on affected systems.  This pattern was removed from TrendAI™'s ActiveUpdate servers and affected customers were initially advised to rollback to the previous version if possible.

TrendAI™ released a new Anti-Spam Engine pattern (version 27128.00) on ActiveUpdate which was reported to resolve the issue.

TrendAI™ is doing a thorough root cause analysis to determine the initial cause of the issue and implement any improvements as necessary.