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This one is hard to answer as there is any number of ways the email count have been sent. The most common ways are... Unsanitized inputs through your website - This happens where you don't sanitize your user inputs and a user is able to pass PHP code directly into your application through your web forms. All user inputs should be sanitized and limited to ...


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This would appear to be due to the emails being detected being sent as a relaay instead of from a correctly configured SMTP server. The best option is to configure your PHP.ini file to use SMTP and to use your gmail server for SMTP and then use the PHP mail() function to avoid this error in the future.



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