The IP information is the same for all three accounts. The IP address is: 22.214.171.124.
126.96.36.199 is a hacker, trying to hack others' email addresses. Its services should be discontinued. - 2010-12-26
This person/s better known as ksk or gp_cowpolk are hacker's from the True blue Fan club of the Dallas Cowboys. -
This person seems to be switching up the targets of their harassment, moving on to friends of the originally harassed party. I would suggest pre-emptive banning in order to avoid feeding the harasser. (In fact, I am avoiding naming any names in order to avoid feeding the harasser as much as possible.)
You may find information on banning a user from a personal journal here, and from a community here.