
If you don't control the mail server that your web pages are hosted on, you will not be able to actively redirect spambots, but there are steps you can take by altering the mail links on your webpages.
These give you a variety of choices on how to encode your addresses, and some explain what's going on as well.
Methods to avoid automatic email harvesters - www.niksula.hut.fi/~jjudin/howto_cheat_email_scanners/
How and Why of obfuscating your address - members.cox.net/timandbeth/spam/
Hiding Email From Spammers - www.ecomhelp.com/KB/internet/kb_hiding-from-spammers.htm
Encode Your Email Address - mypage.direct.ca/s/schinke/encode/ - mirrors: 1
Email Address Encoder - rumkin.com/tools/mailto_encoder/ - mirrors: 1
Webmasters' Guide to Outsmarting Idiot Spammers - www.cexx.org/spamguide.htm
Win the Spam Arms Race - www.alistapart.com/articles/spam/
Anti-Spam Tips – How to Get Less Spam - www.altruists.org/projects/ga/free_services/as/
Obfuscating e-mail addresses - www.december14.net/ways/js/nospam.shtml
Hiding Email Addresses - www.csarven.ca/hiding-email-addresses
Fighting SpamBots - post.queensu.ca/~trd/other/unscrapable.html
JavaScript: Protect your email address - www.joemaller.com/js-mailer.shtml
EScrambler - innerpeace.org/escrambler.shtml
AntiSpambotMailto - www.cleanmymailbox.com/free.html
Javascript Email Address Protection - ssmedia.com/Utilities/Unicode/
Email Countermeasures - members.cox.net/timandbeth/spam/spam.htm
Spam Junkyard - www.spamjunkyard.com/
Générateur d'adresses codées - aspirine.org/emailcode.php
SafeMailto - w2.syronex.com/jmr/safemailto/ - graphic turing test, explained in multiple languages
AntiSpambotMailto() - www.kenric.com/AntiSpambotMailto.html
Spam-Proof Email Address Generator - www.quarella.co.uk/email/spamproof.html
Mailto: tag JavaScript Conversion Tool - external-file.com/en/bagongbayani/mail.html
Email Riddler - www.dynamicdrive.com/emailriddler/
Mailto: tag JavaScript Conversion Tool - external-file.com/en/bagongbayani/mail_type2.html
SpamSpan - www.spamspan.com/
JavaScript Verschlüsselung - www.skoom.de/service/email-verschluesseln.xtc
Obfuscate Mailto - johnhaller.com/jh/useful_stuff/obfuscate_mailto/ - ASP, PHP
Email Address Encryption for Websites - www.webfooters.com/utilities/emailencoder.html
Spam-proof Your Web Page - www.seafield-technologies.com/spam-proof/
Hide HTML code - www.digsys.se/js_hide.html
Spam Vaccine - www.matterform.com/?page=spamvaccine/ - Mac/Win
TagsLock - www.tagslock.com/ - “encrypts” whole webpages
better_spam_protect - www.unicom.com/sw/better_spam_protect/ - for Movable Type
MailMask - www.mailmask.net/
Email Cloaker for Web - cloaker.xinbox.com/
AltaRiver Spam Blocker - www.ar-spam-blocker.com/
Link Disguiser - linkdisguiser.com/
SpamSpan - www.spamspan.com/
Obfuscator Tool - obfuscatortool.sourceforge.net/
Obfuscate Mailto - johnhaller.com/jh/useful_stuff/obfuscate_mailto/ - ASP, PHP
Email Link Encoder - www.alexnolan.net/software/email_link_encoder.htm
E-mail Anti-Spam Encoder - www.siteup.com/encoder.html - sends encoded address to you by email
fantomas mailShield - fantomaster.com/famshield0.html
Email Address Encoder - www.wbwip.com/wbw/emailencoder.html
Verstecken Sie Ihre E-Mail Adresse - www.lerneniminternet.de/htm/tip_spam-email.html
Email, Link and Text Protector - mkweb.bcgsc.bc.ca/emailencode/
Hiding your email address from spammers - homepages.comnet.co.nz/disguise.html
Email Obfuscator - www.alicorna.com/obfuscator.html
Spam-me-not - www.zapyon.de/spam-me-not/
Spam-me-not E-mail Link Obfuscator - www.ianr.unl.edu/email/encode/
Prevent Spam - manas.tungare.name/projects/prevent-spam/
Protect your Email Address - www.killersites.com/webDesignersHandbook/emailObscucator.htm
Encode Your Email Addresses For Free - www.knechtology.com/stop-spam/email_encoder.html
Iconico Online Email Protector - www.iconico.com/emailProtector/
mailto obfuscator - www.awes.com/obfuscator/ - Win
E Cloaker - www.codefoot.com/software/ecloaker/ - Win
Spam-me-not - www.zapyon.de/spam-me-not/ - Java, CFML, PHP, ASP, Python
Obfuscator Tool - obfuscatortool.sourceforge.net/
NATATA antispam encoder - natata.hn3.net/antispam_encoder.htm
HTML Entities - www.w3.org/TR/REC-html40/sgml/entities.html
Special Characters - www.trans4mind.com/personal_development/HTMLGuide/specialCharacters2.htm
Unicode Index - fantomaster.com/faunicodes.html
Clever and innovative, this site shows how to use CSS to hide an email address from spambots.
Hiding email address from spambots - phoenity.com/newtedge/hide_email_spambots/
Redirect mailto - jamesthornton.com/software/redirect-mailto.html - Perl, OpenACS, PHP, ColdFusion, ASP
PHP FormM@iler - www.dbmasters.net/index.php?id=19 - PHP
CGI program - cui.unige.ch/~queloz/AntiSpam.en.html - C
These services provide a webform so you can avoid using your email address at all. If you operate your own mailserver you could install a formmail script, but be aware that people might be able to spam through it if you're not careful.
Contact-us-online - www.contact-us-online.com/
spambot.com - www.spambot.com/
Morgle - www.morgle.com/
XInbox - xinbox.com/
SpamBlock - www.supportsentry.com/spamblock.html
bloXpam - www.bloxpam.com/
PageMailr - pagemailr.com/
iNames - www.inames.net/service_contact.html
Graphic @ - jamesthornton.com/software/graphic@.html
MHonArc mail archive spam deterrents - www.mhonarc.org/MHonArc/doc/resources/spammode.html
HiddenMail - www.hiddenmail.org/ - uses a web-based CAPTCHA
Mask Email Image Generator - digitalcolony.com/lab/maskemail/maskemail.aspx
E-Mail Icon Generator - services.nexodyne.com/email/index.php
E-Mail Graphic Signatures - esigs.brightdev.com/
Encryption of Your E-Mail Address - address-protector.com/
PrivacySig.com - privacysig.com/
TinyMailto - tinymailto.com/ - uses a web-based CAPTCHA
Hide my email - www.hidemyemail.net/
Mail2Image - www.mail2image.com/
reCAPTCHA Mailhide - mailhide.recaptcha.net/ - uses a web-based CAPTCHA
jeaig: jgc's email address image generator - jeaig.org/
You can manually distort your email address so that it is not machine-readable, but humans can still send you email.
Address Munging FAQ - members.aol.com/emailfaq/mungfaq.html
Guide to Staying Off Junk Email Lists - www.junkbusters.com/ht/en/harvesting.html
Falsche E-Mail-Adressen - www.gerlo.de/falsche-email-adressen.html - German
Fending Off Automated Mass Emails - www.firstmonday.org/issues/issue3_2/beke/
Munging is Considered Harmful - www.interhack.net/pubs/munging-harmful/
Reserved Top Level DNS Names - www.rfc-editor.org/rfc/rfc2606.txt