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ESMTP (Extended SMTP (Definition of protocol extensions to the Simple Mail…

- - - - Extended version of remote message queue starting command TURN
    - - Supply helpful information
      - Feature of SMTP that permits a remote host to start processing of the mail queue on a server so it may receive messages destined to it by sending the TURN command
      - This feature was deemed insecure
    - - Delivery status notification
    - - Command pipelining
    - - Chunking
    - - Message size declaration
    - - Authenticated SMTP
      - Provides an access control mechanism
      - Consists of an authentication step through which the client effectively logs into the mail server during the process of sending mail
    - - Transport Layer Security
    - - Authenticated TURN for On-Demand Mail Relay
    - - Allow UTF-8 encoding in mailbox names and header fields
    - - 8 bit data transmission
      - Standardized in 1994
      - Facilitates the transparent exchange of e-mail messages containing octets outside the seven-bit ASCII character set
    - - Allow UTF-8 encoding in mailbox names and header fields
      - Provides the capability for sending email to internationalized addresses