Cuong Lai Dinh

Please use any of these. The most popular <a href="https://wordpress.org/plugins/search.php?q=contact+form&sort=popular" rel="ugc">contact form</a> on WordPress.
Recommended WordPress Plugins
<ul>
<li><a href="https://wordpress.org/plugins/sb-paginate/" rel="ugc">SB Paginate</a></li>
<li><a href="https://wordpress.org/plugins/sb-tbfa/" rel="ugc">SB TBFA</a></li>
</ul>
<h4>Need support</h4>
If you want to get support, please visit <a href="http://hocwp.net/blog/sau-contact-plugin/" rel="nofollow ugc">HocWP</a> blog for more detail.

Sau Contact

A simple contact form for your blog, it supports simple math captcha.

Nitroweb

KacperSzarek

It adds multiple file upload capability to Contact Form 7. You may also attach the files to the outgoing email. You will reveive all files in one zip file. It requires ZipArchive() installed and enable in PHP.

Multifile Upload Field for Contact Form 7

This plugin can define the file size limit and can compact the files into one zip file to send by e-mail.

Great plugin, works perfectly

Multiple files upload field addon for Contact Form 7

Sau Contact vs Multifile Upload Field for Contact Form 7