Skip IP fallback if harden enabled

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

@@ -1019,27 +1019,28 @@ public class EmailService implements AutoCloseable {
                                 return;
 
                             // Fallback: check server/certificate IP address
-                            try {
-                                InetAddress ip = InetAddress.getByName(server);
-                                for (String name : names) {
-                                    if (name.startsWith("*."))
-                                        name = name.substring(2);
-
-                                    try {
-                                        for (InetAddress addr : InetAddress.getAllByName(name))
-                                            if (Arrays.equals(ip.getAddress(), addr.getAddress())) {
-                                                Log.i("Accepted " + name + " for " + server);
-                                                return;
-                                            }
-                                    } catch (UnknownHostException ex) {
-                                        Log.w(ex);
+                            if (!harden)
+                                try {
+                                    InetAddress ip = InetAddress.getByName(server);
+                                    for (String name : names) {
+                                        if (name.startsWith("*."))
+                                            name = name.substring(2);
+
+                                        try {
+                                            for (InetAddress addr : InetAddress.getAllByName(name))
+                                                if (Arrays.equals(ip.getAddress(), addr.getAddress())) {
+                                                    Log.i("Accepted " + name + " for " + server);
+                                                    return;
+                                                }
+                                        } catch (UnknownHostException ex) {
+                                            Log.w(ex);
+                                        }
                                     }
+                                } catch (UnknownHostException ex) {
+                                    Log.w(ex);
+                                } catch (Throwable ex) {
+                                    Log.e(ex);
                                 }
-                            } catch (UnknownHostException ex) {
-                                Log.w(ex);
-                            } catch (Throwable ex) {
-                                Log.e(ex);
-                            }
 
                             String error = server + " not in certificate: " + TextUtils.join(",", names);
                             Log.i(error);