Secure Password Authentication
Encyclopedia
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). The protocol was based on the Integrated Windows Authentication
(NTLM) authentication scheme.
Microsoft
Microsoft Corporation is an American public multinational corporation headquartered in Redmond, Washington, USA that develops, manufactures, licenses, and supports a wide range of products and services predominantly related to computing through its various product divisions...
protocol used to authenticate Microsoft email
Email
Electronic mail, commonly known as email or e-mail, is a method of exchanging digital messages from an author to one or more recipients. Modern email operates across the Internet or other computer networks. Some early email systems required that the author and the recipient both be online at the...
clients with an electronic mail server when using the Simple Mail Transfer Protocol
Simple Mail Transfer Protocol
Simple Mail Transfer Protocol is an Internet standard for electronic mail transmission across Internet Protocol networks. SMTP was first defined by RFC 821 , and last updated by RFC 5321 which includes the extended SMTP additions, and is the protocol in widespread use today...
(SMTP), Post Office Protocol
Post Office Protocol
In computing, the Post Office Protocol is an application-layer Internet standard protocol used by local e-mail clients to retrieve e-mail from a remote server over a TCP/IP connection. POP and IMAP are the two most prevalent Internet standard protocols for e-mail retrieval. Virtually all modern...
(POP), or Internet Message Access Protocol
Internet Message Access Protocol
Internet message access protocol is one of the two most prevalent Internet standard protocols for e-mail retrieval, the other being the Post Office Protocol...
(IMAP). The protocol was based on the Integrated Windows Authentication
Integrated Windows Authentication
Integrated Windows Authentication is a term associated with Microsoft products that refers to the SPNEGO, Kerberos, and NTLMSSP authentication protocols with respect to SSPI functionality introduced with Microsoft Windows 2000 and included with later Windows NT-based operating systems...
(NTLM) authentication scheme.