sending mail by php via the server software (like sendmail or postfix) usually has been rejected by the Mail Service Provider (such as gmail.com/outlook.com), or goes to spam;
so, you can build your own mail server;
or
to receive customer's e-mail or store's email copy, use your own domain mail instead of 3th party email;
to send mail to customer's email address, i have not find any good solution.



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