SmartMail's Smart Segments automatically update every 24 hours and whenever an email to the segment is sent. Segments are set to auto-update at 6:00am EST. 

If you'd like to manually update your segment before sending a campaign, click the refresh button while on the Smart Segments tab.

or click the Show button within the Smart Segment.

Note: Most segments will update within a minute, but larger lists can take up to 5 mins to populate.

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