Thanks for the info. 2.2.4 is not available as binary for OS X though and frankly I am not very optimistic that 2.2.4 will work because I don`t get downloads (always Low ID and 0 sources for all but 1 download) with 2.2.3 despite various tries with portforwarding ports (tried standard ports and 5-digit custom ports) aswell as switching off the software firewall.
eMule on Windows worked immediately after setting up port forwarding.