The QueueDirectory option in your configuration file tells sendmail where to find its
queue directory:
O QueueDirectory=/var/spool/mqueue
The location of that directory must be a full pathname. Its exact location varies from
vendor to vendor, but you can always find it by looking for the QueueDirectory
option in your configuration file.
Beginning withV8.10, sendmail allows multiple queue directories to be used. Sucha
declaration can look like this:
O QueueDirectory=/var/spool/queues/q.*
Here, sendmail will use the subdirectories in /var/spool/queues that begin with the
name q. for storage of messages. Suchdirectories might be called, for example, q.00
and q.01.
If you have permission, take a look at a sendmail queue directory. It might be empty
if no mail is waiting to be sent. If it is not empty, it will contain files such as these:
dfg17NVhbh002596 dfg1BHotav010793 qfg17NVhbh002596 qfg1BHotav010793
When a mail message is queued, it is split into two parts, each part being saved in a
separate file. The header information is saved in a file whose name begins with the
characters qf. The body of the mail message is saved in a file whose name begins
with the characters df.
The previous example shows two queued mail messages. One is identified by the
unique string g17NVhbh002596 and the other by g1BHotav010793.
The internals of the queue files and the processing of those files are covered in
Chapter 11 on page 394.
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