Smtp servers that are listed in DNS area must be accessible, otherwise, there is a risk that emails may be lost

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When a sending server makes a connection to the recipient server, the recipient server notes the sending IP address and performs a reverse lookup, called a PTR lookup, named after the type of DNS record used. If the result of the reverse lookup matches the result of a forward DNS Lookup, then it's much more likely that the message is legitimate. If the IP address doesn't match, it's much more likely that the sending address was spoofed and therefore much more likely that it's unwanted and could be considered spam.

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According to the RFC 2181, smtp server should accept HELO command

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According to the RFC 2181, smtp server should accept EHLO command

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STARTTLS turns an unencrypted connection into a secure connection. Note: You can use a service like altospam to solve this problem. Click on the link below to learn more

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EXPN command is now considered to be a security risk, spammers being able to harvest valid e-mail addresses via each mailing list.

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As the EXPN command, VRFY is used by spammers to verify an address.

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If a server is open relay, there is a risk that spammers use your server to send illegitimate mail.

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According to the RFC 2142, SMTP server should accept abuse@yourDomain as a recipient.

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According to the RFC 5321, SMTP server should accept postmaster@yourDomain as a recipient.

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The banner must return (2xx) a valid (4xx) or temporary code.

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Banner must contain the name of the server

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There is a risk to display the type and the version of the server, because people can find a breach for a specific version and use it

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The domain must have an A field in order for the website to be accessible.

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WWW host is not required for a website, but it's better to have one.

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It is highly recommended to have an IPv6 for the website.

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If you configure a WWW host for your website, it is recommended to have an IPv6.

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This test verifies the presence of a website for the given IP or domain. Then scans port 80.
If the domain or IP is pointing to a website then port 80 must be open so that it can be accessed from a browser.
Otherwise port 80 must be closed.

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This test verifies the presence of a website for the given IP or domain. Then scans port 443.
If the domain or IP is pointing to a website then port 443 must be open so that it can be accessed from a browser.
Otherwise port 443 must be closed.

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To avoid giving details to malicious people, the version of the server should not be visible.

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To avoid giving details to malicious people, the technology that supports the application should not be visible.

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Using "HttpOnly" instruction prevents someone to access to cookies via Javascript. The secure flag will allow you to prevent a cookie from ever being communicated in simple HTTP. (RFC 6265 section 8.3)

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The HTTP X-XSS-Protection response header is a feature of Internet Explorer, Chrome and Safari that stops pages from loading when they detect reflected cross-site scripting (XSS) attacks.

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The HTTP Content-Security-Policy response header allows web site administrators to control resources the user agent is allowed to load for a given page. With a few exceptions, policies mostly involve specifying server origins and script endpoints. This helps guard against cross-site scripting attacks (XSS).

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The only defined value, "nosniff", prevents Internet Explorer from MIME-sniffing a response away from the declared content-type. This also applies to Google Chrome, when downloading extensions.

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