Putting certain adresses and in some cases domains into an exception list so that even when someone is subscribed using an address in the mentioned list is automatically excluded when sending out campaigns is needed. Is there such a functionality in Sendy?
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And when you send a campaign, it won't be sent to 'bounced' emails.
If you need to, you can use PHPmyAdmin to manually set the subscribers' 'bounced' column to '1'.