email breakin

[bello]

my ex broke into(hacked) my yahoo email via business web site I was working on for myself through dreamweaver application- I'll spare you the drama...
but does this sound feasible to anyone? and I'm worried that they're still
accessing my account.
also, it would be great to return the favor- it may not be right but it would be just...if anyone knew where i could find an app. or recipe to do so it
would be great to show them how it feels to be violated- and make possibly them stop breaking in.
thanks for your time-