proto=
The protocol used in transmission syslog equate
The $r
sendmail macro ($r on page 842) holds as its
value the protocol that was used when a mail message
was first received. That value is either SMTP,
ESMTP, or internal, or it is a protocol assigned
with the -p
command-line switch (-p on page
246). If $r lacks
a value, this proto=
syslog equate is omitted. If
$r has a value,
the first 20 characters of that value are printed
following the proto= in the
syslog line:
proto=ESMTP
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