ebian:/home/andy# aptitude install Enigmail
Reading package lists... Done
Building dependency tree... Done
Reading extended state information
Initializing package states... Done
Reading task descriptions... Done
Building tag database... Done
Couldn't find package "Enigmail".  However, the following
packages contain "Enigmail" in their name:
  enigmail-locale-ca enigmail-locale-de enigmail-locale-cs
  enigmail-locale-el enigmail-locale-fi enigmail-locale-fr
  enigmail-locale-ja enigmail-locale-hu enigmail-locale-it
  enigmail-locale-nb enigmail-locale-nl enigmail-locale-pl
  enigmail-locale-sk enigmail-locale-sl enigmail-locale-ru
  enigmail-locale-sv enigmail-locale-zh-cn enigmail-locale-es-ar
  enigmail-locale-es-es mozilla-thunderbird-enigmail enigmail
  enigmail-locale-pt-br