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Is it possible to update/add subscriber names (via CSV import) after a list has been imported?
I.E. I imported a full list of email addresses only, is it now possible to import an updated list that also contains the subscriber names as well?
There's no way to do that using Sendy's interface. When you import a CSV into Sendy, it looks for duplicate and if they're found, Sendy won't import it.
You will need to use the API to update subscriber fields. Pass in the email and the name, the API will update the name when it finds an email match. You may need to write a script to loop through every email.