I created new template for my website and I added One of the Google fonts (Cairo). The font is appear everywhere in the website but when I receive the email on my google email or outlook the font disappear.
I add <link href="https://fonts.googleapis.com/css?family=Cairo&display=swap" rel="stylesheet"> to the Header tab from the template but it doesn't work.
I opened template.php and added the this line exactly before closing the head </head>:
$before .= '<link href="https://fonts.googleapis.com/css?family=Cairo&display=swap" rel="stylesheet">';
but it doesn't work too.
Any other solution