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SMTP Valid Hostname

What you see when your domain has this problem
Reverse DNS is not a Valid Hostname Details area Ignore
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More Information About Smtp Valid Hostname

Your Reverse DNS Record (PTR) is not a valid host name. According to email sending best practices, a PTR Record should be a valid host name. If the PTR Record is not a valid hostname, there is a likelihood that you will experience email delivery issues with anti-spam services.