Added mail validation function to Contact Form 7. Protected by rejection filter, RFC filter, and DNS filter.

asamaruk

<p>Email Verification Filter for Contact Form 7 provides additional functionality to Contact Form 7’s mail verification feature.<br />
To use it, you need to install Contact Form 7.<br />
The following three filters are provided, and this plugin will work after Contact Form 7 has been validated.</p>
<h4>Reject filter</h4>
<p>Specify the email address or domain of the user you want to reject, and restrict submissions from the form.<br />
The target users can be the email addresses or domains specified in the administration screen.</p>
<h4>RFC Filter</h4>
<p>Restrict form submissions from email addresses that do not conform to RFC specifications and requirements.<br />
A period [.] is the first character, an at mark [.] is the second character, and so on. is used at the beginning, before an at mark [@], or consecutively.</p>
<ul>
<li>example.@example.com ([. @]) The domain is correct, but a period [.] is entered before the at mark [@]. is typed before the at mark [@])</li>
<li>example..123@example.com([…] typed in. The domain is correct, but a period [.] is entered in succession. is entered consecutively)</li>
</ul>
<h4>DNS Filter</h4>
<p>Checks if the domain of the email address entered is registered with the DNS server and if it is a valid email address for submission.<br />
The problematic email address will be restricted from submitting the form. The following email addresses that pass Contact Form 7 validation are restricted.</p>
<ul>
<li>example@example.comcom (Enter [comcom]. A domain that does not exist)</li>
<li>example@example.com.com (Enter [.com.com]. Non-existent domain.)</li>
</ul>


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