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2.1.6 sent-on-behalf Field

The sent-on-behalf field is optional. If this field is present, it contains the email address of the sending mailbox owner. This email address MUST be different from the address contained in the reverse-path field. This address MUST be formatted in one of the following formats:

  • An SMTP email address, as specified in [RFC2821].

  • A DN (1) address, as specified in section 2.1.1.

Neither format is preferred over the other. The choice of format is left to the implementation.

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