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456 | Chapter 11: Manage the Queue
??? If the sender is not specified in the envelope, the address that is used is that of the user
who ran the sendmail program. If that user is unknown, the sender is made to be
postmaster.
??? When processing the queue, the sender??™s address is specified in the S line of the qf file.
The form of the S line in the qf file looks like this:
Saddr
The S must begin the line. Exactly one address must follow on that same line. Whitespace
can surround that address. There can be only one S line in the qf file.
If the addr is missing, sendmail sets the sender to be the user who ran sendmail. If that user
is not known in the passwd file (or database), sendmail syslog(3)s the following message
and sets the sender to be postmaster:
Who are you?
The resulting address is then processed to extract the user??™s full name into $x (?§21.9.103 on
page 851). Finally, the sender??™s address is rewritten by the canonify rule set 3, the parse
rule set 0, and the final rule set 4.
Under all versions of sendmail, the address in the S line will include any RFC822 comment
text that appeared with the original message. Under V8.7, if the F=c flag (?§20.8.19 on page
768) is set for the sender??™s delivery agent, all comment text is stripped from the address.
If sendmail is compiled withUSERDB defined (?§3.
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