sendmail prog aliases don't understand mixed case

[cak at Purdue.ARPA]

From:  Christopher A Kent <cak at Purdue.ARPA>

Description:
	Program aliases in sendmail get converted to all lower case
	before the exec() call, apparently by the same code that
	converts all the recipients to lower case (this is also a bad
	deal if you have mixed case login ids).
Repeat-By:
	Build a program alias with mixed case. I have a private
	"vacation" program, so I changed my .forward to be

	\cak
	"| /usr/cak/Mail/Recmail"

	When I sent a letter to test it, I got back

	From: Mail Delivery Subsystem <MAILER-DAEMON>
	Subject: Returned mail: unknown mailer error 1
	To: cak
	Date: 14 Dec 1983 1041-EST (Wednesday)

	   ----- Transcript of session follows -----
	/usr/cak/mail/recmail: Command not found.
	554 "| /usr/cak/Mail/Recmail"... unknown mailer error 1

	   ----- Unsent message follows -----

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