Why local = 0 ?

[NDSoftware]

Hello,

Why local = 0 in received.c ?

I get:

Received: from muncher.math.uic.edu (131.193.178.181)
  by 0 with SMTP; 6 Aug 2001 22:17:56 -0000

And i have the same problem with a new qmail installation.

How i can fix the problem ?

Thanks very much