Mails not receiving in Production

Hi Friends,

I transported some workflow objects to Production.

all workflows are running correctly.

Inspection Lot (BUS2045) is not working. it is triggering correctly.

In Log status is : Mail sent.

Adress string also i am getting mail id's. But mails are not coming to outlook.

Other objects mails are coming.

Please help me....

Thanks,

Naresh Kumar P.