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4 Mail Loops

    4.1	Message-ID: Cache

    fml check Message-ID: duplication within messages fml receives by
    default.  The cache file size is $MESSAGE_ID_CACHE_BUFSIZE (default
    60*100) bytes.  The number of cache files is $NEWSYSLOG_MAX + 2.
    Approximately fml checks duplication over the past 600 mails.

    4.2	Unique X-ML-Info: header field

    X-ML-Info: field has the ML address. It must be unique. Mail with
    "X-ML-Info: ML" must not be injected to the fml.  Under this
    conjecture, we check and reject mails with "X-ML-INfo: our ML".

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