ENHANCEDSTATUSCODES FAIL

I sort of expect an SMTP server that claims to support enhanced status codes to, y'know, put enhanced status codes in its responses...

220 bill.internal.[redacted] ESMTP Symantec Mail Security
EHLO ppsw-0.csi.cam.ac.uk
250-bill.internal.[redacted] says EHLO to 10.0.64.17:58126
250-ENHANCEDSTATUSCODES
250-PIPELINING
250 8BITMIME
MAIL FROM:
250 MAIL FROM accepted
RCPT TO:
554 Recipient address rejected: User unknown
RSET
250 RSET OK
QUIT
221 bill.internal.[redacted] closing connection