Any idea? Is there a configuration option (beside the watched headers listing) that could be the problem?
Sample headers of a test mail:
X-OTRS-TicketKey2: original-date-mssql
X-OTRS-TicketValue2: 2009-09-01 08:09:06
X-OTRS-TicketKey3: original-date-unix
X-OTRS-TicketValue3: 1251787566
OTRS Version is 2.4.5