Solved - fixed DNS on this machine.
hardware failed. move drives to nearly identical box (linux). less memory.
messages keep arriving in the queue but do not get pushed to user inboxes.
help
UPDATE: queue info implicated cyren.
Fail-info: Filter Cyren(127.0.0.1:9088):[ERROR]: Still unable to connect to Datacenter
Status:PROCESSING ERROR
MBox
I disabled cyren service and messages began arriving in inboxes.
Still a mystery because cyren is running an listening on 127.0.0.1:9088