Once you send them, they are on your ISP's system and delivered to the recipients email inbox a few milliseconds later, where it would take a police order to have them retrieved.
The only exception is where they are in a company LAN system, where they do not travel outside the company system (never out to the "internet" email system). Then, if the recipient has not collected them from the company email server they can (if its a permitted activity) be recalled. That is because they never "left the building".
Exceptions. Don't know how well it works but there are ways to retrieve/delete sent emails.
To unsend an email in AOL:
Select Mail | Sent Mail from the menu in AOL.
Highlight the message you want to take back.
Click the Unsend button.
Note that you can (effectively) unsend an email only if:
The message was sent to AOL recipients only.
You cannot take back an email if it also has been delivered to internet recipients, not even from AOL recipients.
You sent the message from AOL itself, not from an email client using IMAP and SMTP to access an AOL email account.
The message has not yet been read by any recipient.
Works for Windows AOL 8/9. Mac AOL OS X.
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