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en.wikipedia.org/wiki/Internet_Message_Access_Protocol

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Posted by crouse

SMTP is a hop-by-hop protocol, meaning that a sending host does not know the ... leaving all your mail on the server makes retrieving new mail quite slow.

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Posted by waqasahmad

POP3 and IMAP4 are used to retrieve mails.

IMAP4 stores a copy of message on the server whereas POP3 does not.

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Posted by alwin