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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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