[Exim] VRFY response = 252? Why not 5xx?

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Author: John Dalbec
Date:  
To: Exim Users Mailing List
Subject: [Exim] VRFY response = 252? Why not 5xx?
Exim 4.14:

EXPN <ljk@???>
550 Administrative prohibition
VRFY <ljk@???>
252 Administrative prohibition

Why the difference? Is this a bug?
Thanks,
John Dalbec