I got another mail from the support now, with some helpful links.
Somebody already sent a bugreport about this problem for ZCS Version 7.1.4 (Bug 77756 – Setting attribute zimbraSSLExcludeCipherSuites does not exclude the cipher suite).
There you have a link to openssl with mappings from cipher suites: OpenSSL: Documents, ciphers(1)
I just used the mappings and excluded the ciphers again with the mapped name. Tomorrow when the vulnerabilit scanner comes by at the IP:Port where I had
the problem I will know if it really solved my problem or not. I will let you know the result of this.
In the bug report is also a link where you find the cipher suites supported by java/jetty: Java Cryptography Architecture Sun Providers Documentation
Maybe this will help you guys.
ADDED Fri 5 Oct 2012 15:54 CET:
Ok guys, Nessus still reported the ciphers I excluded, also the ones that I excluded again two days ago with the name from the openssl mappings page. I will try to test it with sslscan and see if the result is different. But I don't know yet when I will find the time to do so.