Allow disable confirming email addreesses

app/src/main/java/eu/faircode/email/AdapterMessage.java

@@ -5937,10 +5937,9 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                 String scheme = guri.getScheme();
                 String host = guri.getHost();
 
+                String chost = FragmentDialogOpenLink.getConfirmHost(uri);
                 boolean sanitize_links = prefs.getBoolean("sanitize_links", false);
-                boolean confirm_link =
-                        !"https".equalsIgnoreCase(scheme) || TextUtils.isEmpty(host) ||
-                                prefs.getBoolean(host + ".confirm_link", true);
+                boolean confirm_link = (chost != null && prefs.getBoolean(chost + ".confirm_link", true));
                 if (always_confirm || sanitize_links || (confirm_links && confirm_link)) {
                     Bundle args = new Bundle();
                     args.putParcelable("uri", uri);

app/src/main/java/eu/faircode/email/FragmentDialogOpenLink.java

@@ -334,7 +334,7 @@ public class FragmentDialogOpenLink extends FragmentDialogBase {
         cbNotAgain.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
-                prefs.edit().putBoolean(uri.getHost() + ".confirm_link", !isChecked).apply();
+                prefs.edit().putBoolean(getConfirmHost(uri) + ".confirm_link", !isChecked).apply();
             }
         });
 
@@ -581,13 +581,9 @@ public class FragmentDialogOpenLink extends FragmentDialogBase {
 
         cbSanitize.setChecked(sanitize_links);
 
-        cbNotAgain.setText(context.getString(R.string.title_no_ask_for_again, uri.getHost()));
-        cbNotAgain.setVisibility(
-                !always_confirm &&
-                        !sanitize_links &&
-                        UriHelper.isSecure(uri) &&
-                        !TextUtils.isEmpty(uri.getHost())
-                        ? View.VISIBLE : View.GONE);
+        String chost = getConfirmHost(uri);
+        cbNotAgain.setText(context.getString(R.string.title_no_ask_for_again, chost));
+        cbNotAgain.setVisibility(!always_confirm && chost != null ? View.VISIBLE : View.GONE);
 
         setMore(false);
 
@@ -862,6 +858,19 @@ public class FragmentDialogOpenLink extends FragmentDialogBase {
         }
     }
 
+    public static String getConfirmHost(Uri uri) {
+        String scheme = uri.getScheme();
+        if ("https".equals(scheme)) {
+            String host = uri.getHost();
+            return (TextUtils.isEmpty(host) ? null : host);
+        } else if ("mailto".equals(scheme)) {
+            MailTo mailto = MailTo.parse(uri);
+            String to = mailto.getTo();
+            return (TextUtils.isEmpty(to) ? null : to);
+        } else
+            return null;
+    }
+
     public static class AdapterPackage extends ArrayAdapter<Package> {
         private final Context context;
         private final List<Package> pkgs;