problem in sending emails

  • hi
    i have registered two domains in pepipost and one API code generated, in pepipost plugin i can send emails by only one of these domains. when i set the second email domain, email dose not send and the error is:

    Error while sending test message.
    Invalid API key or sender domain used in API call.Hence authentication failed.

    but for first domain it is ok
    can you help me what is the reason?

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