There are two types of email servers POP (Post Office Protocol) and IMAP (Internet Message Access Protocol).
How POP Email Servers Work: One and Done
Let's say you have your email on your office computer delivered through Outlook. When a POP email service-be it Hotmail, Yahoo, Gmail or some hosting company like GoDaddy, sends your mail to Outlook the server either deletes the sent messages or retains a copy in the account.
Either way, once the mail is sent all connection with that server regarding those messages is over. If you are away from your computer and check the email directly on the Web based service, the office Outlook account will look like nothing happened.
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