Obfuscation of email via the [antispambot]...[/antispambot] shortcode syntax using built-in WordPress Codex functionality. It works within widgets as well.
Alternative variations:
[antispambot]user@example.com?subject=foo+bar&body=baz[/antispambot] creates a mailto: link with subject and body pre-populated[antispambot nolink=1]user@example.com[/antispambot] just displays the email without a link wrapping it[antispambot linktext="click here"]user@example.com[/antispambot] displays the text “click here” with a link to the email addressNote :- This plugin is inspired from “Anti-Spambot” plugin.