Morten P.D. Stevens:
> Hi all,
> 
> a small question regard to the postfix message id process.
> 
> Every message has a unique ID provided by the postfix messaging process.

The queue file name is only unique while the message is stored in
the queue. Once the message is delivered the queue file name can
be used for a different message.

> Some messages have a 11 characters message id and other a 12 characters 
> message ID although our servers all running exactly the same postfix version. 
> (Version: 2.3.3 Release: 2.1.el5_2)
> 
> What's the reason for this difference?

The queue file name contains time information (which is the same
on different machines) and the file inode number, which depends on
what else is in the file system.

        Wietse

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