How to debug DKIM on MacOS X

[Jānis]

Hi!

I am setting up DKIM on MacOS X/Server using Amavis-new. Everything  
seems ok, but when I try to test it using:

\sudo -u _amavisd -H amavisd -c  
/Library/Server/Mail/Config/amavisd/amavisd.conf testkeys

I get the following response:

.... invalid (public key: invalid data)

The DNS record seems to be set correctly (ar least - according to my  
experience with  Linux based systems) and selector working (tested  
with online tools)

How could I get anything more on what is the reason for amavis to  
return such message?

Janis