To quote from the fine article in Deuteronomy, it is written: “Six days you shall labor and do all your work; but the seventh day is a sabbath to the Lord your

To quote from the fine article in Deuteronomy, it is written: “Six days you shall labor and do all your work; but the seventh day is a sabbath to the Lord your God; in it you shall not do any work, you, or your son, or your daughter, or your manservant, or your maidservant, or your ox, or your ass, or any of your cattle, or the sojourner who is within your gates, that your manservant and your maidservant may rest as well as you.” I.e. you are already not supposed to do any form of work on Shabbat just based on the existing commandments. Naturally that includes work via email or IM.