The H command is used to specify which mail headers to include in a mail message
and how each will look:
HReceived: $?sfrom $s $.by $j ($v/$Z)$?r with $r$. id $i$?u for $u$.; $b
* With the advent of Multipurpose Internet Mail Extensions (MIME), the message body can now be composed
of many mini-messages, each with its own MIME header and sub-body.
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1.8 The sendmail.cf File | 35
This particular H command tells sendmail that a Received: header line must be added
to the header of every mail message. Headers are covered in Chapter 25 on
page 1120.
1.8.4.9 Priority
Not all mail has the same priority. Mass mailings (to a mailing list, for example)
should be transmitted after mail to individual users. The P command sets the beginning
priority for a mail message. That priority is used to determine a message??™s order
when the mail queue is processed:
Pjunk= -100
This particular P command tells sendmail that mail with a Precedence: header line of
junk should be processed last. Priority commands are covered in Chapter 25 on
page 1120.
1.8.4.10 Trusted users
For some software (suchas UUCP) to function correctly, it must be able to tell sendmail
who a mail message is from. This is necessary when that software runs as a different
user identity (uid) than that specified in the From: line in the message header.
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