Actually, oddly enough, I did not think about that. Thanks for the tip. We have changed the email address from time to time, when one gets picked up by spam.
We do like the subject line to be a pass/fail test though - especially on jobs that require attention to detail (i.e. bookkeeping or junior developers who are on support/punch lists).
The instructions are pretty clear and if someone cannot follow step one, they are probably not going to be able to follow our internal checklists.
