If the guy can't put a period after "Mr" that should have been the first clue!
The second clue, he/she/them/it requests old features - ones that are shelved, renamed, or dissolved.
Third clue, was the brevity of the note. No request, no instructions, and no introduction.
Fourth Clue, no info on the net for either the name or company.
Fifith Clue, no return address, tel no. etc.
Sixth Clue, reproduction of many same notes to other writers.
This smells of a bait and switch scam. Don't give it the time of day. Write instead!
People who really are interested show their interest.