Sadly there are a number of "spambots" which roam the web "harvesting" email addresses to send spam to. Often you have no choice but to include a mailto link with an email address on a web page. Fortunately most of these spambots do not seem to have complete HTML parsers, and most do not execute JavaScript.
This free Email Address Obfuscator uses obfuscation to generate a "mailto:" link which will confuse naïve spambots, but will still work in standard browsers. It also generates an alternative version which requires the Spambot to execute JavaScript.
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Note: the above are affiliate links to companies we use. Signing up using these links helps pay for the cost of this page.