Delivery reports cannot guarantee 100% accuracy for delivery or open tracking. Your recipients may have received and read your invitation even if the report does not confirm it.
Why Reports May Be Incomplete
Email clients disable tracking mechanisms as a spam prevention measure. The recipient's right to privacy takes precedence over delivery confirmation. Qflow has no control over recipient security settings, and in some cases (such as corporate firewalls) the recipients themselves cannot change these settings either.
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Creating an online invitation with barcodes and RSVP:
Terms of use: https://qflowhub.io/invite-terms