Hi Kwongmei,
Your use case sounds like a great fit for our eMarketing module. eMarketing allows you to add targeted lists of contacts and send emails across your Cvent account, rather than for one specific event. Here is a helpful outline of the tool:
http://bit.ly/1TMnxO9If you have further questions, I would suggest reaching out to your Account Manager for a potential demo/next steps from a licensing standpoint.
Best,
Danni
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Danni Czark
Lead Client Success Advisor
Cvent
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