final Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);

String emailtext = "Email-Text";
String address = "empfaenger@email.com";
String[] address = { "empfaenger1@domain.tld", "empfaenger2@domain.tld" };
String subject = "Betreff";
              
emailIntent.setType("plain/text");
emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, address);
emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, subject);
emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, emailtext);

MainActivity.this.startActivity(Intent.createChooser(emailIntent, "Send mail..."));