Set te campaign settings to "run only once". the re-launch the campaign. Only the leads that qualify and have not been a member already will be on this second try.
If this is a permanent issue, you can even se the campaign to run every day. each day, the campaign will capture a few new leads and run form them.
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Sometimes, just sometimes, this is a job for Outlook.
It's possible that they have internal blocking or blacklisting. If that's the case they still won't get it. Send the one-off through Outlook, check the logs to see if they're in the list and what happened. Maybe they're unsubscribed or have an invalid email address.