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"PGP signature could NOT be verified"



I have come across this error message "PGP signature could NOT be
verified" and can not make out the reason?
I also checked older postings in mailing list but without worthwhile
results.

I have a key from following user:

pub   1024D/486CBB5C 2002-01-01 [expires: 2006-09-30]
uid                  Hans-Peter Bock (ISW)
<hans-peter.bock@xxxxxxxxxxxxxxxxxxxx>
uid                  Hans-Peter Bock (ISW) <xbk@xxxxxxxxxxxxxxxxxxxx>
sub   2048R/3483796E 2004-06-22 [expires: 2006-06-22]
sub   2048R/863F18A6 2005-01-09 [expires: 2006-06-03]

pub   4096R/9B0746D1 2005-05-07 [expires: 2013-05-05]
uid                  Hans-Peter Bock <hpbock@xxxxxxxxxx>
uid                  Hans-Peter Bock <hpbock@xxxxxxxxxxxxxxxxxxxxxxxx>
sub   1024D/0287D654 2005-05-07 [expires: 2009-05-06]
sub   2048g/80CD2EAA 2005-05-07 [expires: 2013-05-05]

When he sends me an email signed with sub key: 863F18A6, I see following in
mutt:
<snip>
gpg: encrypted with 2048-bit RSA key, ID 863F18A6, created 2005-01-09
...

PGP signature could NOT be verified.


Wheras a signed email with ID 3483796E provides a good signature
message:

<snip>
gpg: Signature made Tue 25 Oct 2005 02:59:55 PM CEST using RSA key ID
3483796E
...

PGP signature successfully verified.

Any idea what could be the reason?
I have this setting in GPG part of .muttrc: set pgp_good_sign="^gpg: Good 
signature from"


Mutt 1.5.9i (2005-03-13)
gpg (GnuPG) 1.4.1
Home: ~/.gnupg
Supported algorithms:
Pubkey: RSA, RSA-E, RSA-S, ELG-E, DSA
Cipher: 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH
Hash: MD5, SHA1, RIPEMD160, SHA256, SHA384, SHA512
Compression: Uncompressed, ZIP, ZLIB, BZIP2


Thanks in anticipation,


-- 
Realos