email from timer

I'd like to have a periodic process that sends email if certain 
conditions are met, but when I try the following
(defun start-watching (&optional (period 600))
  (labels ((check  ()
                  (when <conditions-are-met>
                        (WWW-UTILS:SEND-MAIL-FROM  ...))))
    (setq *watch-process* (mp:make-named-timer "Watcher" #'check))
    (mp:schedule-timer-relative *watch-process* 0 period)))

I get the error "PROCESS-WAIT when scheduling not allowed" whenever 
send-mail-from is invoked from within "check". Perhaps send-mail-from 
does some scheduling itself, but that is not allowed from within the 
context of a scheduled function?
What can I do to fix this?

    Thanks,

        Mark


--
Mark Klein
Principal Research Scientist
Massachusetts Institute of Technology
77 Massachusetts Avenue, NE20-336
Cambridge MA 02139 USA
m_klein@xxxxxxx
http://cci.mit.edu/klein/

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