A friend of mine was just bitten by this. Trying to invoke cmail caused it to never return, and chewed cpu on his box like crazy. Walking through the perl debugger, it seems that he had a zero-size .res file in his $CHESSDIR. Thus, this line in cmail... 1271 shift (@tgames) while (!$tgames[0]) ; ...is an infinite loop. Workaround: Delete the .res file. Cheers.
This report has been left open for way too long. I don't think I get around to fix this, sorry