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Of course, most email clients do give you the option to keep a copy of the original email on the mail server (instead of deleting it). Once the email is downloaded onto one device (and removed from the mail server), it cannot be accessed by another email client or device. In other words, emails are tied to the specific device. The originals are usually, but not always, removed from the mail server. When accessing your emails using the POP3 protocol, a copy of the emails is created and stored locally on your computer. As the name suggests, it allows you to use your email inbox like a post office – emails are downloaded onto your computer and removed from the mail server. your email server receives and delivers the email to your email client based on the protocol you have selected: POP3 or IMAP.

For example, when someone sends an email to your email address (ie. POP3 and IMAP are protocols used to handle incoming emails.
