Hello @AngelaP2 ,
If we're receiving reports from the contact's side that they're opening the emails (whether that's their security program or them actually doing it), then the emails are being received on that end. If they're not showing up in the contact's inbox then it's an issue of the security program outright blocking the emails. I'd advise checking with the contact's IT or whomever has access to their security settings, and make sure all of our domains are safelisted on their side.
Beyond that, the only other advice I can offer is contacting our Delivery team to see if they have any further insight.
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