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  1. Dec 2020
  2. tools.ietf.org tools.ietf.org
    RFC 5321 - Simple Mail Transfer Protocol
    1
    1. toraritte 28 Dec 2020
      2.3.1. Mail Objects SMTP transports a mail object. A mail object contains an envelope and content. The SMTP envelope is sent as a series of SMTP protocol units (described in Section 3). It consists of an originator address (to Klensin Standards Track [Page 11] RFC 5321 SMTP October 2008 which error reports should be directed), one or more recipient addresses, and optional protocol extension material

      The SMTP envelope is sent as a series of SMTP protocol units (described in Section 3). It consists of

      • an originator address (to which error reports should be directed),

      MAIL FROM that refers to the originator (a.k.a., reverse path, backward-pointing address) of the request

      • one or more recipient addresses,

      Multiple RCPT TO for each "to:" rfc822 message header in the mail data (see annotation)

      • and optional protocol extension material.

      DATA (see below)

      (See also envelope-vs-mail tags.)

      smtp rfc5321 envelope envelope-vs-mail
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