[Exim] user ... not found for file existence

I am getting repeated panic log messages like

2000-05-15 17:13:10 user "j.mochales.1999.response" for file existence test not found
2000-05-15 17:19:14 user "j.mochales.1999.response" for file existence test not found
2000-05-15 17:23:17 user "j.mochales.1999.response" for file existence test not found

They don't seem to be associated with any events, and I have a perfectly
normal alias j.mochales.1999

I also have a director

functional_autoreply:
       driver = smartuser
       domains = "lsearch;TABLES/local_domains.common:\
                  lsearch;TABLES/local_domains.THISHOST"
       transport = autoresponders
       require_files = TABLES/forwardfiles/${local_part}.response
       user = exim
       unseen

(I recently added in the user = exim, for the director, but that didn't
fix this.)

There is no .response file for j.mochales.1999

Any hints on what to look at?

-j

-- 
Jeffrey Goldberg                +44 (0)1234 750 111 x 2826
 Cranfield Computer Centre      FAX         751 814
 J.Goldberg@???     http://WWW.Cranfield.ac.uk/public/cc/cc047/
Relativism is the triumph of authority over truth, convention over justice.