MailMessage to MailAddresses Many to many including DB fields

MailMessage to MailAddresses Many to many including DB fields

 modelBuilder.Entity<MailMessage>()
    .HasMany(m => m.MailAddresses)
    .WithMany(a => a.MailMessages)
    .Map(g =>
    {
        g.MapLeftKey(m => m.DBid, "MailMessages_DBid");
        g.MapRightKey(a => a.Address, "MailAddresses_Address");
        g.ToTable("MailMessageMailAddress");
    });