The IMAP Email service allows you to configure your email accounts using the IMAP4 protocol as opposed to the POP3 email protocol.
This way the emails are kept on the server at all times and it's only possible to download the email headers, choosing which messages you wish to read and which to delete, without having to download the entire content.
IMAP is supported by various email clients
More users can use the same account at the same time
You can search within the email folders
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