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Please check the following three possible causes for this issue:
- The MailUp API credentials have been correctly entered in the Magento admin page (System > Configuration > Newsletter)
- The IP address of the Magento-powered Web site has been entered in the MailUp admin console (Manage > Web Services)
- The name of each list in MailUp does not contain special characters (e.g. &, #, <, >, etc.)
This should address the issue and the list of available MailUp Lists should appear in the Magento admin.
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Article ID: 498, Created On: 2/2/2012, Modified: 5/15/2012