No but it isn't as safe as you would think
is it illegal for someone to obtain an email that was not addresses to them?
yes, it is illegal to hack into anyone's email, without their permission.
Most of the time, it is not illegal to forward email. However, there could be places, and circumstances, where it is illegal to forward email. At work, it might be illegal to forward email. It might be illegal to forward an email that has spam, or porno, or a virus in it. It all depends on where you are when you forward the email, who you forward the email to, and what the email contains.
it doesnt
NO...
Yes
no it is not illegal but is good to check first
You can't, only the email provider can do this.
You can report the issue with the relevant authority to track email fraud activity that has your personal information in the email.
Yes, it is illegal to read someone's email without their permission. This is considered a violation of privacy and can be punishable by law.
It is illegal to read other peoples email
it is not legal.