would show you 2 hits : Package fetchmail and Package fetchmail.conf .
I would download both , for Puppy4 from lenny and for Puppy5 from sqeeze+ because of the glibc-version . Don't read the dependency list there .... mostly they say glibc >= 2.7 required but all lenny pkgs ran fine on puppy4 glibc-2.6.1.
Just clicking on a dotDEB file should run the puppy installer and that should extract and install the dotDEB correctly . dotRPM may not work because rpm changes the code quite often .
Then I would run the main command "fetchmail" or whatever it is named , from the console and track the missing libs , if there are any .
So nothing for lazy people ... I am afraid .