Cursory review of recent job postings for the EEOC show that they are hiring statisticians and other quantitative social scientists to review and, for lack of a subtle way to put it, FIND discrimination in the supporting documents you submit with position statements. Submitting thousands of emails sounds almost like professional negligence in the current climate. I deal with the EEOC and their state law counterparts on a daily basis. The previous poster that recommended a simple phone call is spot on, the human connection with investigators is very helpful (though I recommend backing everything agreed to orally in writing).
EEOC charges are free discovery!!! Unless you want to extend the resources to be VERY sure those emails don’t contain anything that could be construed as discriminatory, I would just summarize the point you are making with them and hold on to them.
Good Weekend to all!
David