getTaskMailDetailsReportPreviousDate(userName: string, userId: string, role: string, createdOns: string): Observable<TaskMailModel[]> {
        let params = new URLSearchParams();
        params.set(this.stringConstant.role, role);
        params.set(this.stringConstant.name, userName);
        params.set(this.stringConstant.createdOns, createdOns);