Since Covid I've been using DocuSign for most of our lease/order docs that need signatures. DocuSign will send you and email when the docs are viewed and of course the email with the signed documents return.
Lately I've seen some of the outbound emails (signature envelopes not opened for days). It's always a good practice to send an email to the client after you've sent the DocuSign envelope telling them that the DocuSign was sent.
In some cases depending on your clients email settings DocuSign can be redirected to SPAM. Here' some additional information on that