Error_messages

 %MAILSERV-W-
ALREADYSUB, address is already subscribed to the mailing list

     You are already subscribed to the mailing list. If you used
     the optional address parameter, then the specified address is
     already subscribed. Check to make sure that you specified the
     correct mailing list name or address or both.

 %MAILSERV-W-CANTDELETE, cannot delete old mailing list file

     An error occurred while trying to delete the old mailing list
     file. Try again later; the postmaster in charge of the mail
     server has been notified.

 %MAILSERV-W-CANTUPDATE, cannot update mailing list file

     An error occurred while trying to update the mailing list. Try
     again later; the postmaster in charge of the mail server has
     been notified.

 %MAILSERV-W-ILLADDRESS, illegal address

     You specified an illegal or invalid address for the optional
     address parameter. Resend the command either omitting the
     address entirely or specifying a valid address.

 %MAILSERV-W-INSFPRM, missing command parameters

     You failed to supply the name of the mailing list to subscribe
     to. Resend the command with a list name specification.

 %MAILSERV-W-LNF, list not found

     The mailing list you specified does not exist. Resend the
     command specifying the name of a valid mailing list. You can
     use the DIRECTORY/LIST command to obtain a listing of the valid
     mailing list names.

 %MAILSERV-W-LSTCREERR, unable to create new mailing list

     The mailing list specified by the list-name parameter does not
     exist and could not be created. Check to make sure that you
     specified the correct list name.

 %MAILSERV-W-LSTLOCKED, mailing list currently locked by another user

     The mailing list is currently locked; you cannot subscribe to
     it at this time. Try resending the command again later.

 %MAILSERV-F-NOMAILLIST, mailing lists are not enabled

     The mail server is not configured to operate as a list server.

 %MAILSERV-W-PRV, insufficient privilege or file protection violation

     You are not allowed to subscribe to this mailing list.