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Is it possible to block certain email domains?
If you build your own custom subscription form with Sendy’s 'subscribe' API, you will be able to add this feature (or anything else under the sun).
For example you’ll program your custom subscription form to reject emails belonging to certain domains.
Another way is to create a segment of your list and filter out email addresses ending with “domain.com" (where “domain.com” is the domain you don’t want). Then send your campaign to this segment.