When attempting to use the menu "File->Send->Document as Email", rather than
giving an error message indicating that the settings should somehow be changed,
OOo should either provide the opportunity to immediately select a mail program,
or provide the option to open "Tools->Options->OpenOffice.org->External
Programs" (so the user doesn't have to go looking for it).

Sub-issues.
On Linux, at least, under "Choose a default E-Mail program", selecting kmail for
the "Program", for example, does not satisfy the requirements of an email
program sufficiently to use the "Send->Document as Email". One must also
manually enter the correct "Path" element (typically, /usr/bin/kmail). This is
very unintuitive.

First, OOo should probably suggest a reduced list of email programs based on the
executables it has detected in the $PATH environment, and use the equivalent of
unix `which` to impute the expected value for the "Path" component of the setup
dialog. Users should be able to override the values, but the automation
shouldn't be too difficult and has tremendous value in making the email
functionality of OOo easier to use for inexperienced users.