If you can get your list of emails, for instance, a list of your customers’ email addresses, into one column of a Microsoft Excel worksheet, column A in this example, then you can paste the following formula into a cell, like cell B1, to get those emails, separated by a comma, into one cell.

The formula is       =TEXTJOIN(“,”, TRUE, A:A)

Once those are in one cell you can copy then paste that list into the appropriate box or boxes in the MessageWatcher search tab.