Announcement List Mail

My announcement list has almost 5000 subscribers. When I send out an email using the list user’s email headers are showing
smtp.mailfrom=mailinglistbouncer@dreamhost.com;
dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=thebajaponyexpress.com

What can I change so that the ‘From’ address aligns with the header.from?

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