It seems to me there is no way to get a 100% match with multigram. Example if the dist file contains the address "user@some.domain": echo 'user@some.domain'|/var/list/.bin/multigram -b1 dist gives "user@some.domain 32760 user@some.domain" and echo '=user@some.domain'|/var/list/.bin/multigram -b1 -l32760 dist gives the same result although the addresses are different and =user@some.domain 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