How do prevent this message from occurring?
C:\Mercator6.7\gnupg>gpg -r "Exel_PGP@exel.com" -o "rph4.txt" -e "README"
Could not find a valid trust path to the key. Let's see whether we
can assign some missing owner trust values.
No path leading to one of our keys found.
1024g/E373C042 2001-03-07 "Exel_PGP@exel.com"
Fingerprint: 5BE3 D6D5 018E 1800 D1E9 BA62 C2C7 748B E373 C042
It is NOT certain that the key belongs to its owner.
If you *really* know what you are doing, you may answer
the next question with yes
Use this key anyway?
When I answer yes the encryption takes place