What makes sendmail do this?

[Murray S. Kucherawy]

I'm working on configuring a sendmail daemon, and I have it completely
functional, except when receiving mail for local users, I get this:

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>From MAILER-DAEMON at server1 Fri Mar 22 16:01:23 1991
Received: by server1.datanet.me ( 5.52 (84)/5.17)
	id AA19083; Fri, 22 Mar 91 15:58:46 EST
Date: Fri, 22 Mar 91 15:58:46 EST
From: MAILER-DAEMON at server1 (Mail Delivery Subsystem)
Subject: Returned mail: unknown mailer error 5
Message-Id: <9103222058.AA19083 at server1.datanet.me>
To: <murray at motto>
Status: O

   ----- Transcript of session follows -----
mail: Options MUST PRECEDE persons
554 <murrayk at server1>... unknown mailer error 5

   ----- Unsent message follows -----
Received: by server1.datanet.me ( 5.52 (84)/5.17)
	id AA19081; Fri, 22 Mar 91 15:58:46 EST
Received: by motto.datanet.me (1.2/Ultrix2.0-B)
	id AA10853; Fri, 22 Mar 91 16:01:09 est
Message-Id: <9103222101.AA10853 at motto.datanet.me>
From: murray at motto (Murray S. Kucherawy)
Date: Fri, 22 Mar 1991 16:01:07 EST
Organization: Communications Division, Motorola Canada Ltd., Toronto
X-Mailer: Mail User's Shell (7.1.1 5/02/90)
To: murrayk at server1
Subject: Sample

Sample message

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Answer by either posting or e-mail.

adv-THANKS-ance...

=============================== Murray S. Kucherawy ==========================
Motorola Canada, Ltd.     Communications Division, Toronto      [on work term]
University of Waterloo, Ontario, Canada               2B Math/Computer Science
Internet: murray at motto.UUCP (work)       mskucherawy at watmath.UWaterloo.ca (UW) 
UUCP:     uunet!utai!lsuc!motto!murray   uunet!watmath!mskucherawy