Newsletter HEADER own Code insert?

[Janos Klak]

How or where can i insert my own header-code for a newsletter? Which file needs to be edited?

I want the following code in the newsletter HEADER:

 <link href="https://use.fontawesome.com/releases/v5.0.7/css/all.css" rel="stylesheet">
<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons"> 

The Composer always overwrites the header and CSS.
For CSS Code it’s “newsletter.css” But for the HEADER?

[Author]

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