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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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