If anyone alse would like to do this:
SSH to your fedora box.
Type "ctrl+w" and search for "ServerSignature"
Edit this to ServerSignature off
You can also add "ServerTokens ProductOnly" in the line under to show only Apace, not version.
Type "crtl+x" and save your settings.
Telnet etc to your box and check
This should mask server version and services.
Didn`t find anyting yet on postfix, dovecot, mysql, proftp and pop3....
Doesn`t seem like port 81 gives out any info