How do you resolved below error message:
I am sending from my localhost

Warning: mail(): SMTP server response: 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1) in D:\ProjectsWeb\rdshop\checkout2.php on line 186

    553 generally means that the target mail box does not exist/is invalid. Reading your error message though, it might just be that your server is not configured to relay messages to the recipient's domain.

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