Mail leg

I think you meant to say "mail leg" as in a leg of a letter or a package, right?

If that's the case, a mail leg refers to a section or a stage in the delivery process of a letter or package. It's a term used in the postal industry to describe the journey of a mailpiece from its origin to its destination.

For example, a mail leg might be:

• The leg from the sender's location to the local post office
• The leg from the local post office to a regional sorting facility
• The leg from the regional sorting facility to a national sorting facility
• The leg from the national sorting facility to the final destination

Each leg of the journey is typically handled by a different postal facility or carrier, and the mailpiece is sorted and processed at each leg to ensure it reaches its final destination efficiently and accurately.