For future development, if possible, please consider not sending deletion notices for ads which have simply expired and no longer on public display.
Just doing housekeeping (about 1500 expired ads) and about 1/3 the way through I started getting nastygrams from guys wondering what the emails were about that said "their ad has been deleted"..
I turned off the email preferences in the admin section to continue deleting expired ads and assume that's the way to currently do this.
thanks.