403 Error when granting permission

  • Hi support,

    I am looking for a SMTP plugin and found Mail Bank this small but powerful tool. But when I tried to finish the last step, to get authorization from gmail, it gives me a 403 error.

    https://prntscr.com/qk8tay

    I tried many times, the same result. I already enable the third party application from the security page of google account. No help.

    Could you help me figure out why? and give me some solution?

    Many thanks~
    Stone

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