Actually, it's not a header, just a loop.
 
When the following Usenet posting is sent as a DISTRIBUTE MAIL job, Listserv
hangs trying to figure out the Path: line.  It sits there writing out to its
PUN a lot of blank lines.  After stopping it after about 30 seconds, it had
written a 10000+ record file with only one word at the beginning: "Path:".
 
The Path: line has been wrapped by me and is indicated by a trailing + after
each line which indicates that the following line would continue immediately
there.
 
--Marc
 
//job20Sep89 JOB Reply-To=Sender
distribute mail
//TO DD *
CMF@PITTVMS Carl M. Fongheiser
CMF@PITTUNIX Carl M. Fongheiser
/*
//DATA DD *,Res=Disk
Path: unix.cis.pitt.edu!pitt!cadre.dsl.pitt.edu!pt.cs.cmu.edu!tut.cis.ohio-sta+
te.edu!brutus.cs.uiuc.edu!usc!rutgers!jarvis.csri.toronto.edu!utgpu!watmath!ma+
ytag!watdcsu!mgardi
Sender: CMF@PITTVMS
From: [log in to unmask] (M.Gardi - ICR)
To: MOTSS-L@PITTUNIX
Newsgroups: soc.motss
Subject: Re: The M-word (was Re: How did it happen?)
Message-ID: <[log in to unmask]>
Date: 20 Sep 89 12:02:15 GMT
References: <[log in to unmask]>
Reply-To: [log in to unmask] (M.Gardi - ICR)
Organization: U. of Waterloo, Ontario
Lines: 40
 
[message body here removed - mas]
 
// EOJ