The definition is exactly the same as, and obeys the same rules as, the H
commands in the configuration file (?§25.1 on page 1120). Beginning with V8.10, if the
header lacks header flags, an empty pair of ? characters are prefixed to the definition.
When sendmail writes header lines to the qf file, it pre-expands sendmail macros (replaces
expressions suchas $x withth eir values) and preresolves conditionals ($?, $!, and $.).
Beginning with V8.10, the headers in the qf file might have been rewritten by rule sets.
The order in which H lines appear in the qf file is exactly the same as the order in which
they appear in the delivered message.
11.12.9 I line
Inode and device information for the df file V8.7 and later
When a machine crashes under Unix, files in a directory can become detached from that
directory. When this happens, those orphaned files are saved in a directory called
lost+found. Because filenames are saved only in directories, orphaned files are nameless.
Consequently, Unix stores them in lost+found using their inode numbers as their names.
To illustrate, consider finding these four files in lost+found after a crash:
#1528 #1200 #3124 #3125
Two of these are qf files, and two are df files. Beginning withV8.7 sendmail, th eqf files
contain a record of the inode numbers for their corresponding df files. That information is
stored in the I line:
Imajor/minor/ino
Here, the major and minor are the major and minor device numbers for the disk device that
the df file was stored on.
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