Identify the grammatically correct passive voice sentence.
The envelope was deliverd by the postman.
The sentence "The envelope was delivered by the postman" is the grammatically correct passive voice sentence.
Complete the following task based on the instruction and optional input provided.### Instruction:
Identify the grammatically correct passive voice sentence.

### Input:
The envelope was deliverd by the postman.

### Output:
The sentence "The envelope was delivered by the postman" is the grammatically correct passive voice sentence.