Hello @DianeF74 ,
Is the contact one of your emails' bounces? If she's able to receive the forward (you sending the email from outside our system) and not the direct email sent through us, it means her domain or network is explicitly not trusting the original sendout.
You can look into switching your account's email authentication to self-authentication, since you have your own domain. Otherwise, I'd advise they check on their end to see if their email program or network needs our domains safelisted. They can also look into just marking any emails received from you as safe, by marking your address as safelisted.
Beyond that, I'd advise speaking with our Delivery team for more specialized insight and troubleshooting.
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