[Exim] POP before SMTP?

Hello,

Has anybody successfully implemented a 'POP before SMTP' setup yet?
If so, which POP-daemon do you use? Which were the problems, if any ;) ?

Since I couldn't find any related info on the websites I'd like to collect
replies (-> mail back to me) and I'll summarize to the list.

Best regards,
Volker
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  Volker T. Mueller      Albert-Ludwigs-Universitaet  Freiburg im Breisgau
  Student der Informatik    vtmue@???  +49 761 355-03 -80(fax)

          "Wer unter euch meint, weise zu sein in dieser Welt,
          der werde ein Narr, daß er weise werde."  1.Kor 3,18