Tideline has a number of subscription services built in. Enable the ones you want and disable the others.

NEWSLETTERS
Each week a newsletter is created that summarizes the new postings and events. Choose what it looks like and what gets included use the Weekly Newsletters tool

EMAIL SUBSCRIPTIONS
You can allow readers to subscribe to the weekly newsletter and/or new articles as they are released. Subscribers get the items emailed to them. Tideline handles everything from signing up to sending the emails automatically. Use the Email Subscriptions tool to enable and customize these features.

RSS SUBSCRIPTIONS
You can have Tideline create RSS feeds for many parts of your website. Each night the RSS feeds are updated with the latest info. Use the RSS Subscriptions tool to enable and manage this feature.

LETTING READERS KNOW
Readers can subscribe to email and RSS using commands on the Help & Options menu. In addition you can use the FRONTPAGE > Subscribe box editor tool to place subscription links on your frontpage.