Hallo,

hat sich alles erledigt.
Das Problem hat nicht mein Server, sondern der entfernte (in diesem Fall 
webmail.hansenet.de) gehabt. Ein HHLUG'ler hat sich des Problems 
angenommen und folgendes heraus gefunden:

[EMAIL PROTECTED]:~> openssl s_client -connect 213.191.73.2:25 -starttls smtp
CONNECTED(00000003)
depth=0 /O=webmail.hansenet.de/OU=Domain Validated/OU=Go to 
https://www.thawte.com/repository/index.html/OU=Thawte SSL123 
certificate/CN=webmail.hansenet.de
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 /O=webmail.hansenet.de/OU=Domain Validated/OU=Go to 
https://www.thawte.com/repository/index.html/OU=Thawte SSL123 
certificate/CN=webmail.hansenet.de
verify error:num=27:certificate not trusted
verify return:1
depth=0 /O=webmail.hansenet.de/OU=Domain Validated/OU=Go to 
https://www.thawte.com/repository/index.html/OU=Thawte SSL123 
certificate/CN=webmail.hansenet.de
verify error:num=21:unable to verify the first certificate
verify return:1
quit

Im Gegensatz zu

[EMAIL PROTECTED]:~> openssl s_client -connect mail.gmx.net:25 -starttls smtp
CONNECTED(00000003)
depth=0 /C=DE/ST=Bayern/L=Munich/O=GMX GmbH/CN=mail.gmx.net
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 /C=DE/ST=Bayern/L=Munich/O=GMX GmbH/CN=mail.gmx.net
verify error:num=27:certificate not trusted
verify return:1
depth=0 /C=DE/ST=Bayern/L=Munich/O=GMX GmbH/CN=mail.gmx.net
verify error:num=21:unable to verify the first certificate
verify return:1
---
Certificate chain
Â0 s:/C=DE/ST=Bayern/L=Munich/O=GMX GmbH/CN=mail.gmx.net
 Âi:/C=ZA/ST=Western Cape/L=Cape Town/O=Thawte Consulting 
cc/OU=Certification Services Division/CN=Thawte Server 
CA/[EMAIL PROTECTED]
---
Server certificate
-----BEGIN CERTIFICATE-----
[ der Code der Zertifikates ]
-----END CERTIFICATE-----

subject=/C=DE/ST=Bayern/L=Munich/O=GMX GmbH/CN=mail.gmx.net
issuer=/C=ZA/ST=Western Cape/L=Cape Town/O=Thawte Consulting 
cc/OU=Certification Services Division/CN=Thawte Server 
CA/[EMAIL PROTECTED]
---
No client certificate CA names sent
---
SSL handshake has read 1464 bytes and written 350 bytes
---
New, TLSv1/SSLv3, Cipher is DHE-RSA-AES256-SHA
Server public key is 1024 bit
SSL-Session:
  Protocol Â: TLSv1
  Cipher  Â: DHE-RSA-AES256-SHA
  Session-ID: 
82761154B0B758F3E5566E961D6649CB815CE23C91317CE665A191863A6B7FF3
  Session-ID-ctx: 
  Master-Key: 
ED479576316591322B137C97CA64358A98F0B5C911C6D58916E4EA345E1E3A1DD352DFD53FC5DE6B965B3832E143FA37
  Key-Arg  : None
  Start Time: 1111422749
  Timeout  : 300 (sec)
  Verify return code: 21 (unable to verify the first certificate)
---
220 {mp025} GMX Mailservices ESMTP
quit
221 2.0.0 {mp025} GMX Mailservices
read:errno=0

webmail.hansenet.de prÃsentiert sein Zertifikat nicht, sondern nur den 
Header, daher kann auch keine verschlÃsselte Session gestartet werden.

bis dahin / kind regards

Martin Mewes

-- 
http://webmin.mamemu.de/

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