Analysis of an email's conformation to RFC standards for the Simple Mail Transfer Protocol ( SMTP ) can be used to judge the likelihood of the message being spam.
12.
Enforcing technical requirements of the Simple Mail Transfer Protocol ( SMTP ) can be used to block mail coming from systems that are not compliant with the RFC standards.
13.
Temporary errors are defined in the Simple Mail Transfer Protocol ( SMTP ) as 4xx reply codes : Fully capable SMTP implementations are expected to maintain queues for retrying message transmissions in such cases.
14.
It uses XML Information Set for its message format, and relies on application layer protocols, most often Hypertext Transfer Protocol ( HTTP ) or Simple Mail Transfer Protocol ( SMTP ), for message negotiation and transmission.
15.
DKIM is independent of Simple Mail Transfer Protocol ( SMTP ) routing aspects in that it operates on the RFC 5322 message the transported mail's header and body not the SMTP envelope defined in RFC 5321.
16.
The task is typically accomplished by implementing Simple Mail Transfer Protocol ( SMTP ) and possibly providing access to messages through Internet Message Access Protocol ( IMAP ), the Post Office Protocol, Webmail, or a proprietary protocol.
17.
Mailbox providers typically accomplish their task by implementing Simple Mail Transfer Protocol ( SMTP ) and possibly providing access to messages through Internet Message Access Protocol ( IMAP ), the Post Office Protocol, Webmail, or a proprietary protocol.
18.
Some examples of service ports used for banner grabbing are those used by Hyper Text Transfer Protocol ( HTTP ), File Transfer Protocol ( FTP ), and Simple Mail Transfer Protocol ( SMTP ); ports 80, 21, and 25 respectively.
19.
Noteworthy alumni have graduated from the school, including : Roy Fielding, co-creator of Hypertext Transfer Protocol and the Apache HTTP Server; CAD pioneer; Paul Mockapetris, creator of Domain Name System and the first Simple Mail Transfer Protocol server; Steven Joe, CEO of D-Link North America.
20.
In the Simple Mail Transfer Protocol ( SMTP ) this " reverse path " is also known as MAIL FROM, but paths were also used before and outside of SMTP, e . g . as " bang paths " in UUCP and Usenet ( NetNews ).
