We currently send all of our no fault paper claims thru firm mailing (bulk certified mail). I am looking for other options to send them where I can get proof of timely filing in the event that we ever need it to have a claim processed but skip the trip to the post office. I was considering Stamps.com but it looks like they only offer individual certified mailing and not bulk. This would cost significantly more than the bulk version. Open to other suggestions that would be mode efficient and cost effective. This is for paper claims only. Thank you.