[exim] Subject / Topic (T=) encoding in exim mainlog

Hello group !

I'm trying to find what is the encoding that exim uses, when logging
Topic(T=)/Subject to exim mainlog.

Currently cyrillic subjects are logged to something like this :

\321\201\321\200\320\276\320\272\320\276\320\262\320\265

.....

basically \XXX representations.

Also could you suggest some way of decoding this by external tool or
some algo ?


Thanks in advance !

Regards,