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To send out the subscription emails you MUST invoke the subscription-send script from the DSpace command-line or Processes UI. It is advised to setup this script as a Scheduled Tasks via Cron.  See sample settings on that page. 

# Example of running subscription-send to send out all "Daily" subscription emails
./dspace subscription-send -f D

This script requires the "-f" (--frequency) parameter with a value of "D" (Daily), "W" (Weekly), or "M" (Monthly).  Keep in mind, you will want to schedule it to run on a Daily, Weekly and Monthly basis to send the appropriate emails.