Autoresponder not Sending
Common reason #1
Reason: Changing a regular campaign into an autoresponder. Sometimes users create and send a regular campaign, and after a while, they copy and change the type of campaign into another kind of campaign. that will not work, after you create a campaign (regular) save it and send it, you have to keep it (regular) and the same goes if you create an autoresponder.
Solution: Create an autoresponder from scratch, don't change the type of your campaign after it is configured.