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* Rollover credits - If you don't use your allotted number of emails during a given month, a good email marketing package will allow you to roll unused credits over into the next month, or to purchase additional credits on the fly, in real time.
* Importing lists - You should be able to import entire mailing lists into the online system with a few clicks of your mouse. You should also be able to rent or buy opt-in email lists and migrate them into the system.
* Sequential mailings - The best email marketing software systems allow you to import a series of messages and set up sequential mailings to be sent at the day and time you desire. In other words, you should be able to implement a six-month email marketing campaign in one sitting.