For 10 points, name this service that in early days was plagued by spam.
Extra certification can be provided in this system with Vouch by Reference. A frequent problem with this system often uses a directory harvest attack, but has been partially remedied with the use of Naive Bayesian filters. The (*) SMTP protocol operates this system, and the POP and IMAP protocols are variants on how to handle this service. The MIME format was developed as an extension to this system, and spoofing can be used to disguise the headers in this system. Mozilla Thunderbird and Microsoft Outlook are clients for this system. For 10 points, name this service that in early days was plagued by spam.
Extra certification can be provided in this system with Vouch by Reference.
email (prompt on “spam” before “SMTP”)