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:: MAILSERVER UNSUBS ::
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Syntax: MAILS(ERVER) U(NSUBSCRIBE) <mailing list>

Removes own call from existing mailing list.
Another possibility is to send a mail to the BBS where mail server exist:
  send <boxcall> unsubscribe <servname>
This removes yourself from that mailing list.

See also HELP MAILSERVER SUBSCRIBE