See it work
Thirteen centuries of Pudukkottai, then two new rules
From an 8th-century inscription to the princely state and the district, then the two dates a cashew unit, an engineering works or a lodge has to plan its messages around.
A cashew unit's buyer list was built over years, from phone calls and visiting cards. Having a number is not the same as having permission: before a Pongal price list goes out as a marketing template, the unit needs to know who agreed to receive one, and when.
Replies are different. A buyer who writes first opens a 24-hour window in which prices, photos and answers need no template, each charged at the service rate. The India guide sets out the DPDP timeline, and the 24-hour service window explains the reply rule.