[exim] Brain Teaser - how would you do this?

Top Page
ThreadAuthorDate ()
M+\Marc Perkel
||Mchristoph.kliemt
|MW B Hacker
M\Tony Finch
M|W B Hacker
|M\Marc Perkel
||MW B Hacker
||MMarc Perkel
||MW B Hacker
M|Tony Finch
|MTony Finch
MW B Hacker
MChris Thompson
MTony Finch