This usually occurs if you are using the "Popup" window method of
sending emails, which usually takes about 1 second every 1 or 2 emails.
For larger lists, you should use the 'cron' option, which can send out
about 30,000 emails in an hour, depending on server specifications.
For more information regarding using the cron method, please see the Interspire Email Marketer documentation

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