I don’t know about others, but I find most student emails both time consuming and unhelpful. They are time consuming because when you craft a reply you are only helping one student with one question (so you may have to answer the same question for another student on a different day). And they are unhelpful because students tend to treat email as a bit of a crutch and ask questions before they really think too much about the answer. The problem and one potential solution is discussed here.
Personally, I ban all course content related email (and refuse to reply to it). So, a student can email to say that they have to miss classes due to illness or can seek an extension etc, but cannot email simply to ask a question about course content. All such questions must be asked either in class or through a Q and A on-line forum on the course webpage (hosted on Moodle). Even there, I encourage and incentivise students to answer each other’s questions (with my promise to monitor the forum at least twice a week and tweak answers where necessary). Many people consider running an on-line Q and A forum time consuming, but personally I find the time I save on emails more than makes up for the extra work.
Does anyone still reply individually to student emails asking questions about course content? What other strategies do people put in place?