There is a command for generating a links list, insert-f7. in the
links list you can first letter navigate the list. in gmail for
example, when I open an email and want to reply, I hit insert-f7, then
r for reply. alternatively, you can arrow up and down the links list
for the link you want.

I can't navigate directly to the body of the email in gmail though.
The best I can do is use j and jump to a line number that corresponds
to the beginning of the body.