Jeffrey

Contact Form 7 is an awesome WordPress plugin that provides all sorts of great features for creating Contact Forms. 
I’ve used it on a lot of sites with great succes.
One thing it doesn’t handle though, are customfields. 
With this plug in you can now use customfields in the mail section of Contact Form 7!
I created this plug-in because I had the need to use the same contact form on numerous places but the email adresses needed to be diffrent for all of them. 
(I was using it to create a showcase website in wich visitors are able to contact the creator of the work/art, without showing the full email adress)
What you could do with this might include:
<ul>
<li>Use the same contact form in different posts/pages</li>
<li>Send custom field values in the email </li>
</ul>
There are many more case-specific examples. I searched for a solution, but there was none to be found. 
This plugin provides an elegant solution that leaves the Contact Form 7 Plugin intact.
<h4>WHAT DOES IT DO?</h4>
This plugin provides a new special mail tag for the mail section of the Contact Form 7 Plugin. It allows you to get custom field values in the mail section of Contact Form 7
<h4>HOW TO USE IT</h4>
After installing and activating the plugin, you should use it like the following:
Double underscores are key!
The plug in recognizes a new special mail tag: 
[_customfield]
The tag alone doesn’t work though! 
You need to add two underscores after the tag: 
[_customfield__]
After this you can enter your custom field key i.e.: 
[_customfield__fieldName]
<h4>NOTE</h4>
Multiple values per key (an array) are converted to a comma separated string.

Contact Form 7 Customfield in mail

This plugin provides a new tag type for the Contact Form 7 Plugin. It allows the use of customfields from a post to be used in the mail section

Konstantin Obenland

This plugin lets you specify a header image for each post, page, custom post type or archive page individually, from your default headers and custom headers.
It adds a meta box in the post edit screens with the header selection and a settings field in the edit profile and each taxonomy edit screen. 
If no specific header is specified for a post it will fall back to the default selection. 
There is no change of template files necessary as this plugin hooks in the existing WordPress API to unfold its magic.
Thanks to Erik T. for the idea to this plugin!

WP Display Header

This plugin is not compatible with WP version 4.8.1.

Not compatible

Select a specific header or random header image for each content item or archive page.

Contact Form 7 Customfield in mail vs WP Display Header