New Queue Features

The following list provides details about new queue features.

• The update supports multiple queue directories. To use multiple queues, supply a QueueDirectory option value in the configuration file that ends with an asterisk (*), as is shown in the following example.

  O QueueDirectory=/var/spool/mqueue/q*

  The option value, /var/spool/mqueue/q*, uses all of the directories (or symbolic links to directories) that begin with “q” as queue directories. Do not change the queue directory structure while sendmail is running. Queue runs create a separate process for running each queue unless the verbose flag (-v) is used on a non-daemon queue run. The new items are randomly assigned to a queue.

• The new queue file-naming system uses file names that are guaranteed to be unique for 60 years. This system allows queue IDs to be assigned without complex file-system locking and makes it easy for queued items to be moved between queues.