[exim] exim_tidydb

where is exim_tidydb called? on freebsd 8-current, a number of systems
running amd64 and i386, i have not been able to solve the following:

    Jun  6 00:20:06 work kernel: swap_pager_getswapspace(4): failed
    Jun  6 00:20:06 work kernel: swap_pager_getswapspace(16): failed
    Jun  6 00:20:06 work kernel: swap_pager_getswapspace(14): failed
    Jun  6 00:20:06 work kernel: swap_pager_getswapspace(16): failed
    Jun  6 00:20:06 work kernel: swap_pager_getswapspace(3): failed
    Jun  6 00:20:06 work kernel: swap_pager_getswapspace(16): failed
    Jun  6 00:20:06 work kernel: swap_pager_getswapspace(16): failed
    Jun  6 00:20:06 work kernel: pid 12159 (exim_tidydb), uid 0, was killed: out of swap space

and i was looking for where exim_tidydb was run to see if commenting it
out would move the problem. i assumed exicyclog, but if it is there it
is too subtle for first cuppa.

randy