$i
The queue identifier All versions
Each queued message is identified by a unique
identifier (The Queue Identifier
on page 396). The $i macro contains as its value that
identifier. Prior to V8.6
sendmail, $i had a value assigned
to it only when a file was first placed into the
queue. Beginning with V8.6
sendmail, $i is also given a value
when the queue file is processed.
$i is not used by
sendmail internally, nor
should you use it in a rule set. It should be
trusted for use only in the Received: and Message-ID: headers.
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