Why does it now show received from bounce@focus....co.za

hi Guys

any idea why my campaigns now show the "Bounce@…co.za email and not the email I specify to show?

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@Juan If this has suddenly started happening, then consider what has changed.
Also, is Outlook the email client? Does the same happen for other email clients?

Possibly the From address is on a different domain, which might appear to be an attempt to deceive the recipient.