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Secure Password Authentication (SPA) is a proprietary Microsoft protocol used to authenticate Microsoft email clients with an electronic mail server when using the Simple Mail Transfer Protocol (SMTP), Post Office Protocol (POP), or Internet Message Access Protocol (IMAP). [1] The protocol was based on the Integrated Windows Authentication (NTLM) authentication scheme.
This article has multiple issues. Please help
improve it or discuss these issues on the
talk page. (
Learn how and when to remove these template messages)
|
Secure Password Authentication (SPA) is a proprietary Microsoft protocol used to authenticate Microsoft email clients with an electronic mail server when using the Simple Mail Transfer Protocol (SMTP), Post Office Protocol (POP), or Internet Message Access Protocol (IMAP). [1] The protocol was based on the Integrated Windows Authentication (NTLM) authentication scheme.