I forgot: The IMAP sorts all mailing lists by list-id (and in case of
two lists by to-header) into subfolders of "Mailinglisten".
In MailMate I have defined a smartfolder which builds subfolders by the
list name part of the IMAP folder (because of the two lists):
${#source.path.noinbox/Mailinglisten\///}
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Gruß
Mike