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Asked: 2026-06-07T00:01:58+00:00

I’d like to split my inbox into separate files (one file per one message)

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I’d like to split my inbox into separate files (one file per one message) by bash command, or may be simple program in Java. How can I do it?

WBR, Thanx.

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  1. Editorial Team

    Just use formail. formail is a program that can process mailbox, run some actions for each message in the mailbox, separate messages and so on.

    More info: http://www.manpagez.com/man/1/formail/

    If you want just split a mailbox to separate files,
    I would suggest such solution:

    $ cat $MAIL | formail -ds sh -c 'cat > msg.$FILENO'

    From man:

       FILENO
        While splitting, formail  assigns  the  message  number  currently
        being  output  to  this  variable.   By presetting FILENO, you can
        change the initial message number being used and the width of  the
        zero-padded  output.   If  FILENO is unset it will default to 000.
        If FILENO is non-empty and does not contain a number, FILENO  gen-
        eration is disabled.

    Note: formail is also included in procmail – https://github.com/BuGlessRB/procmail .

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