Can clear email settings Fix #150

BTCPayServer/Controllers/ServerController.cs

@@ -255,7 +255,7 @@ namespace BTCPayServer.Controllers
                 }
                 return View(model);
             }
-            else
+            else if(command == "Save")
             {
                 ModelState.Remove(nameof(model.TestEmail));
                 if (!ModelState.IsValid)
@@ -264,6 +264,12 @@ namespace BTCPayServer.Controllers
                 model.StatusMessage = "Email settings saved";
                 return View(model);
             }
+            else
+            {
+                await _SettingsRepository.UpdateSetting(new EmailSettings());
+                model.StatusMessage = "Email settings cleared";
+                return View(model);
+            }
         }
     }
 }

BTCPayServer/Views/Server/Emails.cshtml

@@ -57,6 +57,7 @@
 
             <button type="submit" class="btn btn-primary" name="command" value="Save">Save</button>
             <button type="submit" class="btn btn-primary" name="command" value="Test">Test</button>
+            <button type="submit" class="btn btn-danger" name="command" value="Clear">Clear</button>
         </form>
     </div>
 </div>