Start by wording a question that makes sense. You said "sent", but you did
not say where the "message" currently is that you want to delete. You said
"sent from his/her mailbox". Did you actually mean that you sent it, your
server connected and it moved from your Outbox to your Sent Items folder?
So, what I 'think' you want to do is delete the message from the recipients
mail server before the recipient logs on and reads it.
If the recipients mail server is an internet POP3 server, you could pretend
you are CIA or FBI and call the mail server and convince them it's a matter
of national security that the message be deleted. I would'nt try though, I
think that may be illegal. If the recipient is a business that owns their
own server, you could call and try to convince them the message contains a
highly malicious code and must be deleted from the server or their whole
system may be irrepairably destroyed. There may be some legal implications
trying that one also, so I'd contact a lawyer first. A third way, and the
one even less likely to be successful, is based on trust. Call the recipient
and tell them it was an error and to please delete it without reading. If it
turns out that you accidently sent your Swedish bank account numbers along
with their respective pass codes, to an ex-wife at 123 @ abc.com instead of
your partner at 132 @ abc.com. You have my sympathies and need to read some
hacker manuals.
