${if inlist{aa}{aa} {in list}{not in list}}
${if !inlist{aa}{aa} {not in list}{in list}}
****
+# listextract from tainted list
+exim -be -oMs my.target.host.name
+'\${listextract {2} {<. $sender_host_name}}' => '${listextract {2} {<. $sender_host_name}}'
+****