''Apparently-To:'' '''


When the message lacks a recipient sendmail

If the header of a mail message lacks recipient information (lacks all of the To:, Cc:, and Bcc: header lines), sendmail adds an Apparently-To: header line and puts the recipient's address from the envelope into the field of that line. This behavior is hardcoded into pre-V8.7 sendmail, but beginning with V8.7, it can be tuned with the NoRecipientAction option (NoRecipientAction).

The Apparently-To: header name is not defined in RFC2822. It is added by pre-V8.7 sendmail because RFC2822 requires at least one To: or Cc: header, and neither is present.

RFC2821 specifically recommends against the use of the Apparently-To: header, so that header should never be defined in the configuration file.

    Part I: Build and Install
    Part II: Administration
    Part III: The Configuration File
    Chapter 21. The D (Define a Macro) Configuration Command
    Chapter 24. The O (Options) Configuration Command