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Weird one here, in some campaigns the csv download button is missing for 'not opened'. Does anyone know the reason for this?
The 'Unopens' export option is only available in the very last campaign that was sent instead of in all campaigns in order not to skew the exported results. I suggest exporting unopens if you need to before sending the next campaign.
If you want to send another campaign to ‘unopens’ only, alternatively, import subscribers who 'opened' your campaign into a new list from the campaign report (Sendy version 5.0 onwards):
Then exclude this list when you send your campaign using the ‘Exclude list’ feature. Emails will be sent only to subscribers who didn't open.