Sorry, I wasn't explicit. I ran the query with format turned on as well. If I run the inner query on its own, then it returns accurate data.
However, in following syntax, it seems to have no bearing on the results. The following two queries return identical result (count, format, table, ...)
source=visitors earliest=-1mon@mon latest=@mon NOT [search source=visitors earliest=-4mon@mon latest=-1mon@mon | table name | dedup name]
source=visitors earliest=-1mon@mon latest=@mon
The actual field is "Email Address".
source=emailusers earliest=-1mon@mon latest=@mon NOT [search source=visitors earliest=-4mon@mon latest=-1mon@mon | table "Email Address" | dedup "Email Address"]
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