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  • Hi,
    Doesn’t seem that its a WordPress problem/SMTP problem since the email sending seems to work from WP using a different adress.

    I would check with your hosting company/admin of mailserver to see if there aren’t any rules setup that disqualify processing mails beeing sent from that certain email adress.
    Some software like SpamExperts thats running on your mailserver that has heuristic rules that will quarantene messages that look like spam based on certain algorithms.

    Make sure that there is nothing blocking the sending from that email adress there.

    Once thats cleared up you can try changing the admin mail in the database directly.
    The confirmation mail should not be blocked because WP assumes that when you have access to the database that email adress is secure and can receive the confirmation mails.

    Please don’t hesitate to explain further if I misunderstood your question!

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