I have the following script in google sheets script which works fine.
function morningemail() {
    var doc = SpreadsheetApp.getActiveSpreadsheet();
    var sheet = doc.getSheetByName("clock script");
    var startRow = 9;  // First row of data to process
    var numRows = 1;   // Number of rows to process
    var dataRange = sheet.getRange(startRow, 1, numRows, 4)
    var data = dataRange.getValues();
    for (i in data) {
        var row = data[i]
        var emailAddress = row[0];  // First column
        var message = row[2] + row[3]; // Second & third column
        var subject = row[1];    // First column
        MailApp.sendEmail(emailAddress, subject, message);
    }
}
I will set the project trigger to activate every 5 minutes but only want the script to send an email if cell "A20" (on the same spreadsheet) is ">10".
I've tried a few ways of doing this but can't get it to work. Any suggestions would be great.
 
     
    