SMTP/ESMTP/POP3 command

SMTP/ESMTP/POP3 command

SMTP command: Helo FQDN identifies the sending SMTP host Mail from: Identify the mail sender Rcpt to: Identify Email Recipient Information Data indicates that the sending host email data is ready for sending. Rset interrupts the current email transmission. VRFY string allows the sender to verify the recipient's validity before sending the email. Help list SMTP commands supported by the receiving host Quit interrupts and closes the SMTP session Turn triggers the receiving server to send messages in the queue to the sending server ESMTP command: Atrn runs only when the session is verified. Etrn specifies the remote host for mail delivery Pipelining allows Batch Sending of SMTP commands without receiving a response Chunking allows more effective sending of large MIME messages X-EXPS gssapi NTLM login uses an effective authentication mechanism, Kerberos and NTLM X-EXPS = login uses an authentication mechanism to support NTLM compatible with exchange server5.5 X-LINK2STATE specifies support for Exchange 2000 connection status commands Xexch50 is used to transmit exchang-specific content in the email Starttls provides an SSL connection between the SMTP client and the server POP3 command: User name provides user name Pass string provides the user password Stat provides mailbox status List list items listing emails Retr msg reads emails Dele MSG mark the email as deleted Noop does not do anything. Only one response is returned. Rset interrupts the current operation and restores the deleted emails. Quit POP3 session