[Bug 273221] DMA does not correctly honor the addresees with the same invocation as sendmail

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273221

            Bug ID: 273221
           Summary: DMA does not correctly honor the addresees with the
                    same invocation as sendmail
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: gjb@FreeBSD.org

In main as DMA had become the default MTA, there is a difference in its
handling of command-line arguments.

Consider a situation where /usr/sbin/sendmail is a link to
/usr/sbin/mailwrapper, and /etc/mail/mailer.conf is set to use /usr/libexec/dma
given the following simple script:

#!/bin/sh
body="Hello world"
subject="Hello"
emailsentfrom="$USER"
emailgoesto="$USER1 $USER2"

printf "From: ${emailsentfrom}\nTo: ${emaiilgoesto}\n \
  Subject: "${subject}"\n\n${body}\n\n" \
  | /usr/sbin/sendmail -oi -f ${emailsentfrom} ${emailgoesto}

With sendmail, "${emailgoesto}" would properly expand to whomever $USER1 and
$USER2 are, comma-separated, which is expected.

With DMA, "${emailgoesto}" is not comma-separated, and are verbatim the
expanded values "$USER1 $USER2", which is not expected.

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