Hi Julian,
If a user is in a usergroup that is allowed to subscribe to the newsletter, then when thye edit their options or register, they will be presented with an option to subscribe to the newsletter and what format they wish to use.
You can also mass subscribe everyone using the admincp tools, however only those in the valid usergroups will get an issue.
Once an issue is generated, it will show how many users are set to recieve the issue.
There are a few cron jobs. One generates data, one that sends data and one that compresses stats.
When the send cron runs, any issues that have not been sent and are active and have people to send to will send the issue out in batches accordingly to your settings.
HTHs!
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