Here is an example of how to include meta tags in the <head> section of your email:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Email Subject</title> <meta name="description" content="This is the preheader text that will show up in the inbox."> </head> <body> <!-- Email content goes here --> </body> </html>