Yahoo's Seven Word Fragments You Can't Say In HTML Email
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eval       => review 
mocha      => espresso 
expression => statement 
javascript => java-script 
jscript    => j-script
vbscript   => vb-script 
livescript => live-script 

Yahoo's hack doesn't respect word boundaries: so evaluate would become
reviewuate, retrieval becomes retrireview.

Note that plain text email is left untouched - only HTML mail gets this
treatment.

There are also a few tags that are verboten:

link   => xlink 
script => cursive 
object => xobject 
embed  => xembed 
body   => xbody 
iframe => xframe 
layer  => xlayer 
applet => xapplet 
meta   => xmeta 
form   => xform 

See <URL:http://www.ntk.net/2002/07/12/> for more details.