While calling the necessary delivery agents, sendmail saves all the error messages it
receives in a temporary file. The name of that temporary file begins with the letters
xf. After all delivery agents have been called, sendmail returns any collected error
messages to the sender and deletes the temporary xf file. If there are no errors, the
empty xf file is silently deleted. A -d51.104 debugging switchsetting can be used to
prevent deletion of the xf file.
See ?§11.3.2 on page 403 for a way to relocate xf files to a memory-based filesystem.
11.3 Using Multiple Queue Directories
Beginning withV8.10, sendmail allows the use of multiple queue directories. These
multiple queue directories take two forms:
??? More than one queue directory can be specified, possibly on separate disks, into
which all the qf, df, and xf files are placed.
??? Any queue directory can have a subdirectory named qf, and/or df, and/or xf, in
which sendmail stores the corresponding qf, df, and xf files.
11.3.1 Multiple Queue Directories
V8.10 sendmail offers the ability to distribute queued messages across multiple directories.
In general, this is a good idea. If, for example, a high volume of email is stressing
your current disk, you can improve efficiency by using multiple queue directories
spread over multiple disks and controllers.
To illustrate, we will set up a machine that has three brand-new disks to use as multiple
queue directories.
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