Unfortunately, our cleaning service will not clean any lists with < 75% valid email addresses; since list cleaning is not 100% accurate, the number of false positive valid addresses means that we would end up sending to a potentially high number of spam traps, dead email addresses, etc.
Instead of uploading the entire list, try to upload alist of contacts who have opted in or opened your other emails within the last 30 days.
Optionally, if you'd like to run a one-click-optin campaign, you can use this URL that will ensure your subscribers do not have to manually enter their email address. See: https://dailyai.freshdesk.com/a/solutions/articles/154000215679
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