Mambo Administration - Meta data, Mail, Statistics
The Metadata tab allows you to add meta description for your website as well as keywords - entering these will allow your website to be easily discovered and listed by the search engines.
Mail tab contains settings for Mambo's mass mail function - that allows you to send messages to all your users. The default settings here are correct and tested to be working with installations on Indichosts.net servers - the only setting that you may decide to change is the sender e-mail address.
Changing the settings in the Cache tab can lead to security issues with user accounts (especially on publicly accessible computers) and are not recommendable.
The Statistics tab has three options. The website would mostly benefit from turning on the first one only, since the other two will collect large amounts of data that will remain on your disk quota.