Hey @akschoeck,
Thanks for reaching out to us.
From your description and the shared From Email, is it possible that you have the mailer set up through Brevo? If you have this setup under Brevo and need to get started with the troubleshooting process, please confirm that you have the sending domain verified as outlined in the?Authorizing Your Domain?section.
Alternatively, if you have this setup through Google/Gmail mailer option as outlined in the Google Workspace / Gmail guide, it’s possible that you might have another plugin modifying the From Email when sending the emails. To isolate this, I recommend running a check for any other SMTP plugin that might be running on the site, and if possible, testing the WP Mail SMTP connection with no other plugins activated.
I hope this helps. Please don’t hesitate to reach out with further questions.