There is no formal support for this service. Look through the archives . We do require that the name of the list be present somewhere in the email headers. Almost all mailing lists do this automatically. A few lists do funny tricks with email headers, and try to hide the name of the list.
Spammers are notorious for forging and hiding headers.
Sometimes even legitimate lists will try to hide the listname. Any list that mangles email headers to hide its name is incompatible with the service and will not be archived. Finally, we will not archive lists whose name does not begin with a letter. Other email archiving sites on the internet do a very good job at importing existing archives. We recommend Geocrawler which is especially good at the task.