What is the best way to deal with people that switched companies and you want to preserve the all information (as well as paired emails) from previous one?

I am currently dealing with the situation what to do with contacts in pipedrive, that are not relevant or that are working in another company right now. My key demands are:
- keep the communication from the previous company (ideally in the same contact's detail page)
- keep the information that the person was working in that company (so we can reach it in the future if he does not know some contacts there)
- avoiding sending group emails on the previous email address (which I have to keep unfortunately so the communication will pair) - this might be done in more elegant way?