
Link exchange email is sent in order to boost the link popularity of a website. It is almost always spam, and should be avoided in favour of less abusive — and more effective — SEO techniques. It is doubly abusive, since it combines email spam with search engine spam. If you hire an SEO, make absolutely sure they will not be sending link exchange spam on your behalf. Spam Links has a very clear policy on link exchanges: don't!
Link exchange spam - www.kith.org/journals/jed/2005/10/18/3208.html
My Link Exchange Policy - www.7nights.com/asterisk/archive/2004/08/link-exchange-policy
Link-exchange requests - www.rickconner.net/spamweb/spam_linkspam.html
Link Exchange Spammers Should Die - jeremy.zawodny.com/blog/archives/004881.html
Link exchange offer spam - www.joewein.de/sw/spam-linkxchg.htm
Alek's two cents on Ads, Link Exchange, SEO, etc. - www.komar.org/contact/ads.html
More spammy link requests - www.mneylon.com/blog/archives/2005/10/10/more-spammy-link-requests/
Wrong on many levels - www.spamnation.info/blog/archives/2007/09/wrong_on_many_levels.html
Guidelines to a Perfect Link Exchange Scam - www.seoresearcher.com/guidelines-to-a-perfect-link-exchange-scam.htm
Don't Be A Reciprocal Linking Turkey - website101.com/arch/archive161.html
SEO Mistakes: link exchange emails - www.mattcutts.com/blog/seo-mistakes-link-exchange-emails/
Just Say NO to Reciprocal Links Requests & YES to Content! - website101.com/NO-reciprocal-linking.html
Link Exchange Requests - www.seo-blog.com/link-exchange-request.php
The Clueless SEO Link Exchange Directory - www.seoconsultants.com/links/free/
Microsoft Banning Sites from Live.com For Link Exchanges - www.seroundtable.com/archives/006742.html