Hello @MattD2 ,
If the contact isn't showing as a bounce, and the email isn't ending up in their spam, then something on the receiving end is quarantining the email / preventing it from even pinging us that it's being bounced back.
Besides safelisting your email addresses in their system, I'd recommend the following:
If you have additional questions regarding those processes, or need further assistance regarding your delivery, I'd advise reaching out to our Delivery team.
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