README.pingpong: removed

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DOCS = README.encoding README.memoryleak README.ares README.curlx	\

 README.hostip README.multi_socket README.httpauth README.curl_off_t	\

 README.pingpong

 README.hostip README.multi_socket README.httpauth README.curl_off_t

CMAKE_DIST = CMakeLists.txt curl_config.h.cmake

Date: December 5, 2009

Pingpong

========

 Pingpong is just my (Daniel's) jestful collective name on the protocols that

 share a very similar kind of back-and-forth procedure with command and

 responses to and from the server. FTP was previously the only protocol in

 that family that libcurl supported, but when POP3, IMAP and SMTP joined the

 team I moved some of the internals into a separate pingpong module to be

 easier to get used by all these protocols to reduce code duplication and ease

 code re-use between these protocols.

FTP

 In 7.20.0 we converted code to use the new pingpong code from previously

 having been all "native" FTP code.

POP3

 There's no support in the documented URL format to specify the exact mail to

 get, but we support that as the path specified in the URL.

IMAP

SMTP

 There's no official URL syntax defined for SMTP, but we use only the generic

 one and we provide two additional libcurl options to specify receivers and

 sender of the actual mail.