![](https://beehaw.org/pictrs/image/78aa5512-a577-4372-8b04-c89f463d8d7d.jpeg)
An email of all html is an unwanted email 99% of the time. Occasionally, I save it, and open in lynx. (When a web site emails a security code.)
Attachments are more of a hassle, because I frequently need those. Save to a temp file, “munpack file”, examine extracted files.
If the package manager on your old PC is keeping copies of everything it installs, just copy all of those packages over and go through the package manager on the new PC. Look under /var/cache