The first Web Mail implementation was developed at CERN in 1993 by Phillip Hallam-Baker as a test of the HTTP protocol stack. This led to the discovery that the specification of the POST method was faulty, requiring the introduction of the Content-Length header. In the later year, the CERN-PTG daemon was released but was not developed further. Webmail is any email client implemented as a web application running on a web server. Examples of webmail software are Roundcube and SquirrelMail. Examples of webmail providers are AOL Mail, Gmail,, and Yahoo! Mail.

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