The ability to segment your list based on the data that you have gathered from your website, and then send targeted emails to those groups at different times during the day and week. There are not many providers of this type, so Pushalert is an excellent resource for our clients. I wish there were more time zones available. I am able to schedule outbound messages in my favorite time zone, but when there is a need to reach some people outside of that time zone, it can be difficult. The ease of creating new email lists, and the ability to quickly change them as they grow or shrink.
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