Name
proto=
Synopsis
The $r
sendmail macro ($r)
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). 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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