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Chitu, Alex, How Gmail Blocks Spam. Google Operating System: Unofficial news and tips about Google (29 oktober 2007). Geraadpleegd op 12 februari 2009. "Gmail's filters are constantly improving and an important ingredient of their effectiveness is the use of community signals. Every time you click on the "Mark as spam" button, Gmail uses that information to block similar future messages not only for you, but for all Gmail users also."
How do I enable POP?. Google (3 september 2007). Geraadpleegd op 1 juni 2008. "You can retrieve your Gmail messages with a client or device that supports POP, like Microsoft Outlook or Netscape Mail."
Gmail Help Center. Mail.google.com (28 juni 2013). Geraadpleegd op 4 juli 2013.
Google Apps. Google. Gearchiveerd op 26 maart 2010. Geraadpleegd op 8 december 2007. "The Partner Edition comes with APIs that make it simple for you to provision, customize, and integrate Google Apps into your existing infrastructure. [...] We designed Google Apps Partner Edition to affordably meet the specific needs of ISP's [sic] and portals."
