I send my forms to IRS Certified mail, but I do not request return receipt. You can still track certified mail and get online tracking that will indicate the return has been received. In my opinion, the return receipt doesn't add anything to the tracking info.
You can also get a "proof of mailing", which is less expensive and shows you mailed the return. However, I prefer paying a few extra dollars and being able to track, which you can't with proof of mailing.
You can also send many returns electronically.
