Register Sisimai::MTA::InterScanMSS
Add sample mail from Trend Micro InterScan MSS
Test code for Sisimai::MTA::InterScanMSS
Call Sisimai::MTA::InterScanMSS
Add MTA/InterScanMSS.pm into the module list
Key name of time stamp has been changed from "date" to "timestamp"
Update test code for changed key name: timestamp