Assuming you want to send 1 email to everyone at the same time, write a query that will return these with semicolons between them. Put this query into an Execute SQL Task. Have the Execute SQL Task populate a variable with a string data type by mapping the Result Set's one column to the variable name. In the next step in the flow have a Send Mail task with with an expression for the property of ToLine set to the value of your variable.
Let me know if you need more detail on any of the above,