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I try to add an email in a list of a client. I can't. I found in the database this email in an other list in an other client.
I think you check in all the database (multiple clients) if the emails is right, and if it's bounce (it can be bounce temporary...) for exemple, we cannot add the email in a list.
Can you verify?
Emails marked as 'bounced' in Sendy are 'Hard bounces'. This means they permanently do not exist and is invalid. So when you add an email into a list, if the same email was marked as bounced on any other list on any brand, it will not be imported.