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:: MAILSERVER SUBSCR ::
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Syntax: MAILS(ERVER) SU(BSCRIBE) <mailing list>

Adds own call to existing mailing list.
Another possibility is to send a mail to the BBS where mail server exist:
  send <boxcall> subscribe <servname>
This adds yourself to that mailing list.

See also HELP MAILSERVER UNSUBSCRIBE