anybody??? please

The browse permission only allows the user to view the node (and its children), have you tried removing the Update permission?

You could use a custom save event composer to not allow users to save any content on the homepage. You could just allow your email to save the homepage.

using Umbraco.Core;
using Umbraco.Core.Composing;
using Umbraco.Core.Events;
using Umbraco.Core.Models.Membership;
using Umbraco.Core.Services;
using Umbraco.Core.Services.Implement;
using Umbraco.Web;
using Umbraco.Web.Security;

namespace UmbracoBuild.Composers
{
    [RuntimeLevel(MinLevel = RuntimeLevel.Run)]
    public class SavingEventComposer : ComponentComposer<SavingEventComponent>
    { }

    public class SavingEventComponent : IComponent
    {
        private readonly IUmbracoContextFactory _umbracoContextFactory;

        public SavingEventComponent(IUmbracoContextFactory umbracoContextFactory)
        {
            _umbracoContextFactory = umbracoContextFactory;
        }

        public void Initialize()
        {
            ContentService.Saving += ContentService_Saving;
        }

        private void ContentService_Saving(IContentService sender, ContentSavingEventArgs e)
        {
            IUser currentUser = null;

            foreach (var node in e.SavedEntities)
            {
                using (UmbracoContextReference umbracoContextReference = _umbracoContextFactory.EnsureUmbracoContext())
                {
                    var userTicket = umbracoContextReference.UmbracoContext.HttpContext.GetUmbracoAuthTicket();
                    if (userTicket != null)
                    {
                        currentUser = Current.Services.UserService.GetByUsername(userTicket.Identity.Name);
                    }

                    //your homepage node
                    if (node.ContentType.Alias == "homePage" && node.Id > 0)
                    {
                        //only allow your username to save the homepage
                        if(currentUser.Username != "your_username_here")
                        {
                            e.Cancel = true;
                            e.CancelOperation(new EventMessage("Error", "You do not have the permissions to save this page.", EventMessageType.Error));
                        }

                    }
                }
            }
        }

        public void Terminate()
        {
        }
    }
}

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