Hi mathijs84,
In order to improve delivery rates, the plugin uses the general WordPress admin email address in the From header and then adds your custom address as Reply-To headers.
This was a decision that came about after many users experienced problems with their emails not being sent or ending up in spam. I found that the admin email address is a more reliable From address in general use-cases.
However, each email server has it’s own particular requirements, so you can change this if you’d like. I’ve written a micro-plugin to help you do this. To use it, click the Download link at the top right. Unpack the .php file and then open the .php file in a text editor, like Notepad. Find the line that looks like this:
return '[email protected]';
Change the email address in this line to match the email address you’d like to use for the From header in the email. Then save the .php file, upload it to your /wp-content/plugins/ directory and activate it from your WordPress admin area.
Once you’ve done this, you should make sure to test the booking form. Many email servers have restrictions on what email addresses can be used in the From header. And many recipient servers (eg – gmail.com, hotmail.com, etc) will throw your email into spam if you’re missing DKIM or SPF records which authenticate the From address with the email server.
Your web host can help you work through any problems you have on this front, as they’ll know their own setup.
