I intalled opendkim with sendmanil (on Ubuntu) without any problem, and followed the same procedure for installing on another server (Debian with postfix), but it does not work. Strangely, there is no error in the log files too.
Some time back I ran across an post? story? Example: port 22 closed, telnet port 12345, telnet port 12345, telnet port 12345, (withing say 10 seconds), port 22 opened. I just hope someone has a better memory than I do.