Rare legal term for the person to whom a document or notice is addressed, typically in the context of service of process or official correspondence.
The court sent the documents to the addressee.
Common term for recipient of a package or letter; 受送達者 is a rarer, more formal legal term specifically for the addressee in official service of documents.
Also means addressee, but more common in postal or general contexts; 受送達者 is limited to legal service of process.
Compound of 受 (receive), 送達 (service, delivery), and 者 (person). The exact historical derivation is uncertain; it appears to be a modern legal coinage.