perl manitou-mdx --conf=/path/to/config_file --mboxfile=/path/to/mboxfile \
  [--tag=optional_tagname] [--status=1] [--mailbox=dest@domain.tld]

If the --tag option is used and the tag doesn't exist, it will be created. The --status=1 option has the effect of marking the imported mail as already read, otherwise it will be considered as new. Optionally, the --mailbox argument can be used to specify to what mailbox the messages should be assigned. The mailbox will be created in the database, if it doesn't exist.