Although your guests will have no doubt received your invitation, we cannot 100% guarantee that you’ll be notified that it was delivered or opened.
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Spam is the reason email programs disable the mechanisms that could be used to track email reception.
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This means your recipient’s right to privacy overrides your need to know if it was delivered or not.
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We have no control over your customers’ security settings and in some circumstances they don’t either (when working behind company firewalls).

Useful Link:
Creating an online invitation + barcodes & RSVP

Terms of use - https://qflowhub.io/invite-terms