How about shedding some light instead of heat on this?

FALCON.DOL-ESA.GOV
	no os info in domain db
	accepts but immediately drops telnet connections
	I don't recognize the sendmail/ftp

CAIS3.CAIS.COM
	claims to be "4.3 BSD UNIX"
	rejects smtp connections
	wu ftp

LEIDECKER.GSFC.NASA.GOV
	NeXT Mach
	sendmail is "NX5.67d/NX3.0S"
	ftp is "Version 5.1 (NeXT 1.0) Wed Sep 15, 1993"

All three machines seem a little off the main line; the latter two could
plausibly be running ancient nameserver code--are they?  In fact, what version
of which nameserver code is each machine running?  What complaints about
www.netbsd.org are in the nameserver logs?  Are those complaints present
for any other machines?

Dave