send-email: allow sendmail binary to be used instead of SMTP
This should make local mailing possible for machines without a connection to an SMTP server. It'll default to using /usr/sbin/sendmail or /usr/lib/sendmail if no SMTP server is specified (the default). If it can't find either of those paths, it'll fall back to connecting to an SMTP server on localhost. Signed-off-by: NEric Wong <normalperson@yhbt.net> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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