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Post Office Protocol
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===POP4=== POP4 exists only as an informal proposal adding basic folder management, multipart message support, as well as message flag management to compete with IMAP; however, its development has not progressed since 2003. There are now two known POP4 server implementations. As of October 2013, the POP4.org domain and website are now hosted by simbey.com, which also runs the other POP4 [http://www.pop4.org/ server implementation.]<ref>{{cite web |archive-url=https://web.archive.org/web/20171021231958/http://www.pop4.org/pop4/pop4spec.html |archive-date=2017-10-21 |url=http://www.pop4.org/pop4/pop4spec.html |title=POP4 specification although pop is used to receive mail after system is not online. |year=2003 |access-date=2011-10-17}}</ref>
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