SendinBlue: How can I use a custom email as sender for my newsletter (Scope-to-Email)?

Sender E-Mail DE: https://help.sendinblue.com/hc/de/articles/208836149-Schritt-3-Erstellen-eines-neuen-Absenders EN: https://help.sendinblue.com/hc/en-us/articles/208836149-Step-3-Creating-a-new-sender

DKIM/SPF Settings DE: https://help.sendinblue.com/hc/de/articles/208848209-So-personalisieren-Sie-Ihre-DKIM-Signatur EN: https://help.sendinblue.com/hc/en-us/articles/208848209-Customise-your-DKIM-signature

Optional: Verify domain DE: https://help.sendinblue.com/hc/de/articles/115000185270-Was-ist-eine-verifizierte-Domain-auf-Sendinblue- EN: https://help.sendinblue.com/hc/en-us/articles/115000185270-What-is-a-verified-domain-on-Sendinblue-