SafeMailLink for Umbraco prevents spambots from harvesting email addresses from your webpages.
This package dynamically encodes all the "mailto:" links found on your rendered webpages at runtime. Any "mailto:" links with pre-populated parameters for subject and body fields are also encoded. Email addresses used as text for the email hyperlink are protected as well.
No further configuration is required to set-up this package, just install and forget.