Greetings, Friends [or Esteemed Colleagues], Due to high workload, I am currently checking and responding to e-mail twice daily at 12:00 P.M. ET [or your time zone] and 4:00 P.M. ET. If you require urgent assistance (please ensure it is urgent) that cannot wait until either 12:00 P.M. or 4:00 P.M., please contact me via phone at 555-555-5555. Thank you for understanding this move to more efficiency and effectiveness. It helps me accomplish more to serve you better. Sincerely, Tim Ferriss