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The problem is indeed on your customer's end. Your Postfix is configured to reject invalid hostnames provided by anything that attempts to deliver mail to it. This is a reasonable measure and prevents a lot of spam. But, your customer's mail server connected and provided an invalid hostname in the EHLO greeting. When Postfix tried to look up the hostname, ...


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I'm not sure what answer you'd like. Neutral is rejected because that's what the daemon says it's going to do, if you invoke that configuration option. It notes, as you've highlighted, that this is not RFC-compliant. But here's the rub: you are not obligated to accept any particular email at your server. There is no Central Internet Court where, beneath ...


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would be faster enable the X-PHP-Originating-Script header by allowing it in php.ini file by option mail.add_x_header = On. Then just check new email in mailq.



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