RewriteCond %{HTTP_USER_AGENT} Diamond(/1\.0|bot) [NC,OR]
RewriteCond %{HTTP_USER_AGENT} EmailSiphon [NC,OR]
RewriteCond %{HTTP_USER_AGENT} EmailWolf [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ExtractorPro [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Mozilla.*NEWT [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Clariabot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Crescent [NC,OR]
RewriteCond %{HTTP_USER_AGENT} CherryPicker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} webbandit [NC,OR]
RewriteCond %{HTTP_USER_AGENT} WebEMailExtrac [NC,OR]
RewriteCond %{HTTP_USER_AGENT} NICErsPRO [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Teleport [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Zeus.*Webster [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Microsoft\.URL [NC,OR]
RewriteCond %{HTTP_USER_AGENT} LinkWalker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} internetseer\.com [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ia_archiver [NC,OR]
RewriteCond %{HTTP_USER_AGENT} DIIbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} psbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Dual\.Proxy [NC,OR]
RewriteCond %{HTTP_USER_AGENT} EmailCollector [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Kontent_Smarts [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Wget [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Xenu\.Link\.Sleuth [NC,OR]
RewriteCond %{HTTP_USER_AGENT} DataCha0s/2\.0
RewriteRule !^.*\.403\.php$ - [F,L]