Confirming E-Mail

Hey @timg1955 welcome to the community! There are a couple of different ways of sending Zoom Meeting invites when scheduling your meeting. First do you mind me asking how you scheduled your Zoom meeting whether that was from the Web Portal or Zoom Desktop Client? 

Secondly, when you enter the Zoom contact or email address of who you are inviting to the meeting, once scheduled there is no way of confirming if they've receiving your Zoom Meeting invite (that I know of 🧐) unless they have some email filtering setup, spam, etc. 

Here is an example from the Zoom desktop client inviting an external email address to my Zoom Meeting: 

You could leverage Scheduling and customizing a meeting with registration and resend confirmation emails.