The legal definition does not require them to use paper mail, and it’s a rounding error in the USPS budget.
Here’s what they’re required to do:
> In the case of a notification required to be sent by a motor vehicle manufacturer, by certified mail, verifiable electronic means such as receipts or logs from electronic mail or satellite distribution system, or other more expeditious and verifiable means to all dealers and distributors of the vehicles that contain the defect or noncompliance.
Here’s what they’re required to do:
> In the case of a notification required to be sent by a motor vehicle manufacturer, by certified mail, verifiable electronic means such as receipts or logs from electronic mail or satellite distribution system, or other more expeditious and verifiable means to all dealers and distributors of the vehicles that contain the defect or noncompliance.
https://www.law.cornell.edu/cfr/text/49/577.7