Mail Transfer SMTP Specification SMTP basics
Mail Transfer SMTP Specification SMTP basics
Mail Transfer SMTP Specification SMTP basics
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Commands and ResponsesCommands4 letters (by convention)spaceparametersResponsesSingle Line3 digit codespacehuman messageMultiple Lines3 digit codehyphen "-"human messagesame 3 digit codehyphen (if more lines to follow) space otherwisehuman messageResponse CodesFirst Digit gives response type1Information2All OK3More input required4Temporary Error5Permanent ErrorSecond digit gives specific response typeThird digit gives extra informationAllows error codes to be distinguishedFile <strong>Transfer</strong> Protocol (FTP)FTP uses an unusual communication modelTraditional Client/Server (<strong>SMTP</strong>/DNS/...) :CSClient and serverClient opens TCP connection to serverClient sends commands over connectionServer sends responses back over same connection
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