To add a logo to a "report action - email" you will first need to change the body to be HTML.
This will on my setup create an email looking like:
To add a logo to this email you need to have the logo hosted on an online server (Example: the company website). The server needs to be accessible from the internet (a web-server) so you cannot use any internal only servers.
When the image is located on the internet it can be added to the email using the HTML image syntax:
<img src="http://www.boyum-it.com/typo3conf/ext/boyumtemplates/Resources/Public/Images/logo.png" alt="Logo">
Here I have linked directly to the Boyum logo from our website.
This creates an email looking like:
You need to replace "http://www.boyum-it.com/typo3conf/ext/boyumtemplates/Resources/Public/Images/logo.png" with the URL of your image.
Please note: We currently do not support base64 encoded images embedded into the HTML.