Sequential Number in sent Email

  • Hi there,

    i am trying to build a registration form for a marathon with CF7. My main problem is, that every mail that is sent via that form should get a sequential number (the start number of the user sending the form). Each number should only be used once. The number should start with 1000 and end with 9999.

    Has anyone an idea how i could do that?

    Regards
    Rainer

    https://www.ads-software.com/plugins/contact-form-7/

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