Christian Schröder wrote:

Hi!

Hi Christian,

I am just curious about the maildir format used by Courier IMAP. Some of the file names contain a substring like "S=xxx" where xxx are some digits, e.g. 1067008255.M497859P656V0000000000000304I0000CFD8_2.db1,S=2382:2,S. I could not find any description what this "S=..." part of the file name means. (I have already studied the description at http://cr.yp.to/proto/maildir.html)
Can anyone tell me?

That's because courier-imap uses an extended form of the Maildir format, called Maildir++. In this format, the byte count of the message file is appended to the name so that the total size of the mailbox can be calculated much faster by adding the numbers together instead of calling the stat system call on each file, which is more expensive. So "S=2382" means that the message is 2382 bytes in size. You can read more about Maildir++ here:


http://www.inter7.com/courierimap/README.maildirquota.html


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