I import leads from multiple sources. Sometimes these include contacts that are already in the database, and we don't import contacts. I currently download the list of failed imports and update them manually one-by-one - very tedious!

I'd like to do a search of these contacts that I did not import, so I can run a macro on them. It would be very easy for me to upload or paste a list of email addresses to search on, but I can't find any way to do this. Is it possible?