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.