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I'm a little concerned about backwards compatibility. Someone might get upset if extra >'s start appearing in the messages when they read the mailbox contents with an application that uses the mboxo format.
A little analysis on the possible corruptions that happen with these formats:
- When the mailbox is both read and written using the mboxo format, lines starting with "From " are changed to ">From ".
- When the mailbox is both read and written using the mboxrd format, no corruption happens.
- If the mailbox is written using the mboxo format and read using the mboxrd format, lines that were meant to start with ">From " are changed to "From ". So we essentially get a sligthly different corruption.
- If the mailbox is written using the mboxrd format and read using the mboxo format, lines that were meant to start with ">From " are changed to ">>From ". This is a new type of corruption.