[Evolution] signature fails to verify

[Thomas Liesner <t liesner creativ-consulting de>]

Hi list,

sorry if this has been asked before.

A friend of mine is using Apples' Mail.app and MacGPG to digitally sign
and encrypt massages.
His key is successfuly installed in my gpg-system (v 1.0.7) and his keys
are signed by me.
Encryption and decryption works like charm, but his signed messages fail
to verify. 

While searching for the error i noticed, that there are differences how
evolution and mail.app "attach" the signature to the mail.

My evolution signatures look like this:
    
    --=-rahjJdqcvs/zOC1gduTv
    Content-Type: application/pgp-signature; name=signature.asc
    Content-Description: Dies ist ein digital signierter Nachrichtenteil
    
    -----BEGIN PGP SIGNATURE-----
    Version: GnuPG v1.0.7 (GNU/Linux)
    
    iD8DBQA9ZRhjcLerOga182gRAumJAKC+TVLAf6/j/c8I6R4kEs1ldNfDEACfU9hh
    NjjVMCnTNFAwlNBHg9qbOtI=
    =1Wcg
    -----END PGP SIGNATURE-----
    
    --=-rahjJdqcvs/zOC1gduTv--
    
while his signature looks like this:

    --Apple-Mail-2-161134187
    content-type: application/pgp-signature; x-mac-type=70674453;
    name=PGP.sig
    content-disposition: inline
    content-transfer-encoding: 7bit
    
    -----BEGIN PGP SIGNATURE-----
    Version: GnuPG v1.0.7 (Darwin)
    
    iD8DBQE9ZKyGMMxCGRA1d8MRAnqyAKCIaoDfYExAi+Z2V6D7UjxNBCk5hwCfe1QY
    pNVi7axnYp6WSpL0pbfjXqg=
    =F0Ih
    -----END PGP SIGNATURE-----
    
    --Apple-Mail-2-161134187--
    
Could this cause those errors or is somthing else wrong?

clueless,

//Tom
    
    
-- 
Thomas Liesner - c/o Creativ Consulting GmbH, Ratingen
Email: t liesner creativ-consulting de
PGP Fingerprint: 7B6B 8364 D205 0FA2 8753  AEE0 70B7 AB3A 06B5 F368
PGP Public Key: http://www.creativ-consulting.de/keys

Attachment: signature.asc
Description: Dies ist ein digital signierter Nachrichtenteil