Reports - pdf or Excel ?

Jean Black
Jean Black ✭✭✭
edited 12/09/19 in Smartsheet Basics

I send out weekly reports of our products to our customers with their expected delivery dates (which can change frequently).  If an email address needs to change I am unable to see the original format of their report, so have to guess their preferred format - pdf or Excel.  Short of sending copies of each report to myself each time (there are thousands each week) is there any way of me identifying what has previously been sent?