Many websites offer the service of subscribing to feeds via email, but each has its own focus and characteristics. Feedmailer is also a website that specializes in providing such services, allowing you to set the frequency of feed deliveries and the number of items. Generally, it's better to subscribe to feeds for real-time delivery, meaning that whenever the feed is updated, it will be sent to your email. However, sometimes people may prefer periodic delivery, which varies from person to person and depends on specific situations. Additionally, Feedmailer has a Directory, which is a list of popular feeds on Feedmailer, covering a wide range of topics. If you find any feeds you like, you can also subscribe to them through Feedmailer.