If th e$s macro lacks a value, the word from is inserted in front of the $_.
The $_ macro contains the RFC1413 identd(8) identity of the connecting host and any
IP routing information (?§21.9.1 on page 801).
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1164 | Chapter 25: The H (Headers) Configuration Command
by $j ($v/$Z)
The $j macro contains the full canonical name of the local host. The parentheses
surround a comment that is formed from $v (?§21.9.98 on page 849), the version of the
sendmail program, and $Z (?§21.9.108 on page 853), the version of the configuration
file.
$?r with $r$.
If the $r macro contains a value, the word with followed by the value of $r are inserted
into the header. The $r macro (?§21.9.82 on page 842) contains a string that indicates
the protocol used to receive the message (such as SMTP or ESMTP).
id $i
The $i macro contains the identifier created by sendmail to uniquely identify this mail
message at this host (?§21.9.52 on page 826).
$?u for $u$.
If the $u macro contains a value, the word for followed by the value of $u is inserted
into the header. The $u macro (?§21.9.96 on page 848) contains the recipient??™s
username.
; $b
The $b macro contains the current date and time in RFC2822 format (?§21.9.9 on page
807).
The Received: declaration shown earlier is the one typically used by most sites running V8
sendmail.
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