It is feasible for someone to steal a username/password stored in dreamweaver fairly easily. It had nothing to do with Yahoo!'s services, so blaming them for being 'cheap' is an invalid assertion; any service you went with would be accessible to anyone who you've basically handed the password to.
First thing to do should be obvious, change your damn password!
Second, if you think you have credible proof that your ex is accessing your email, get a lawyer, and the lawyer may be able to legally attain your ex's system to analyze data on the system that would prove they accessed your account, though it is unlikely that you have or will be able to attain such proof.
Lastly, forget trying to hack them back. It's not easy to do for those with some hacking skills and advanced computer knowledge. It's an intuitive art requiring extensive network security knowledge and experience. It's something that you cannot do.
|