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I have been testing new domains that are out there and they are not being added to a list.
For example, I own madpink.tech mad.pink and pink.guru
Emails from these domains will not get added
Here're a list of reasons why some records can’t be imported → https://sendy.co/troubleshooting#some-records-from-csv-not-imported
Also, if you update to the latest version of Sendy, when you import emails and they aren’t imported, Sendy will provide the reasons in a CSV file download.