[Bug 289264] Dragonfly dma parses To: & Bcc: differently than sendmail

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289264

            Bug ID: 289264
           Summary: Dragonfly dma parses To: & Bcc: differently than
                    sendmail
           Product: Base System
           Version: 14.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: standards
          Assignee: [email protected]
          Reporter: [email protected]

dma doesn't like spaces in the To: or Bcc: headers of email unlike most other
MTAs.

My test program:
---
#works:
#To: [email protected],[email protected]
#Fails on dma, works on real sendmail:
#To: [email protected] [email protected]
#Bcc: [email protected] [email protected]

echo test $$
cat <<EOF | sendmail -t
To: [email protected] [email protected]
Subject: test $$

This is a test.
EOF
---

The current rfcs state that a comma is the proper delimiter however a space has
the a defacto separator for addresses going way back to the uucp, mmdf and
bitnet days.  Some older programs will need to be fixed when moving to dma.

Some reasons not to fix this:
The Sendmail Book in section 25.12.4 (page 1111 of 3rd edition) claims 'The
field for the Bcc: header must contain one or more properly formed address. 
Where there is more than one, exach should be separated from the others by
commas.' and cites rfc2822.  rfc2822 3.6.3 states 'The field name, which is
either "To", "Cc", or "Bcc", followed by a comma-separated list of one or more
addresses. Even rfc733 implies the comma should be there.

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