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How do you make postfix create maildir folders automatically for all users?

I have these two lines in postfix main.cf, which supposed do create maildir folder after the first mail but it is not working. What am I missing?

home_mailbox = Maildir 
mailbox_command = 

At the moment mail looks to sent, but nowhere to be found.

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    Shouldn't it be home_mailbox = Maildir/ with a slash (/) at the end if you want a qmail-style directory? See the documentation for home_mailbox. Commented May 30, 2014 at 3:27
  • And with the slash: postfix creates non-existent Maildirs itself. Commented Jun 27, 2022 at 23:14

1 Answer 1

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Cristian's comment is correct: you need a trailing slash to make Postfix store incoming mail in Maildir format:

home_mailbox = Maildir/

If you leave it off, it stores the mail in an mbox-style file of the same name.

That is to say, this is not a setting where you are providing the name of a type of storage, you are providing the name of a file or directory, and Postfix infers mbox vs Maildir based on the trailing slash only. It will use any directory name you put here, not just Maildir.

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