multigram fuzzy matching

It seems to me there is no way to get a 100% match with multigram.
Example if the dist file contains the address "[email protected]":

   echo '[email protected]'|/var/list/.bin/multigram -b1  dist

gives "[email protected] 32760 [email protected]" and

   echo '[email protected]'|/var/list/.bin/multigram -b1 -l32760 dist

gives the same result although the addresses are different and
[email protected] is a valid address. That's rather a bug than a feture 
and makes it impossible to use multigram if you want to have exact matches.

Werner