I've heard that deleting emails from Outlook isn't permanent unless
I can imagine some smart alec telling you to print then shred them.
<g>
I take offense at that =)
What type of email account? If you empty deleted items and compact the
pst, they are effectively gone. Some may be recoverable with forensics
software but the typical hacker won't be able to recover them.
I'd also suggest asking the person who said it in the first place. Odds are
they were talking about a third party add-on that may (or may not) do what
it is advertised to do.