Dmail under sys3

[Brandon S. Allbery]

I have gotten dmail working under System III, by means of much hacking and an
interface to /bin/mail (or /etc/delivermail, for that matter) which reads the
To:, Cc:, and Bcc: lines from a message coming in on stdin (if invoked with
-t; otherwise it execs /bin/mail), discards Bcc:'s, and adds sendmail-style
Date: and From: lines.  If anyone's interested, I'll diff the sources so that I
can #ifdef the changes for BSD42_3, ATT3_5, and RE_V7 and post them, along with
my mail interface.

One flame: if the author of dmail had been working under sys3 he wouldn't
have misused pointers: my first use of setlist caused dmail to dump core when
it did a free(0).  Would it have been much harder to check the list of setlist
header lines for nullity before freeing it?  End flame.

--Brandon
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