usefor-article-11 June 2003

5.2.  From

   The From-header contains the email address(es), possibly including
   the full name(s), of the article's poster(s), or of the person or
   agent on whose behalf the article is posted (see the Sender-header,
   6.2).  The content syntax makes use of syntax defined in [RFC 2822].

      header              =/ From-header
      From-header         = "From" ":" SP From-content
      From-content        = mailbox-list

        NOTE: Observe that there is no provision for parameters in this
        header, or in other headers containing addresses likely to be
        used for sending email (see 4.2.2).  When, for whatever reason,
        a poster does not wish to use a valid address, the mailbox
        concerned SHOULD end in the top level domain ".invalid" [RFC
        2606].

--- ../usefor-article-10/From.out          April 2003
+++ ../usefor-article-11/From.out          June 2003
@@ -1,36 +1,18 @@
 5.2.  From
 
    The From-header contains the email address(es), possibly including
-   the full name(s), of the article's poster(s). The content syntax
-   makes use of syntax defined in [RFC 2822].
+   the full name(s), of the article's poster(s), or of the person or
+   agent on whose behalf the article is posted (see the Sender-header,
+   6.2).  The content syntax makes use of syntax defined in [RFC 2822].
 
       header              =/ From-header
       From-header         = "From" ":" SP From-content
       From-content        = mailbox-list
 
-        Observe that there is no provision for parameters in this
+        NOTE: Observe that there is no provision for parameters in this
         header, or in other headers containing addresses likely to be
-        used for sending email (see 4.2.2).
-
-   Each mailbox in the From-content SHOULD be a valid address, belonging
-   to the poster(s) of the article, or person or agent on whose behalf
-   the post is being sent (see the Sender-header, 6.2).  When, for
-   whatever reason, the poster does not wish to include such an address,
-   the From-content SHOULD then be an address which ends in the top
-   level domain of ".invalid" [RFC 2606].
-
-        NOTE: Since such addresses ending in ".invalid" are
-        undeliverable, user agents Ought to warn any user attempting to
-        reply to them and Ought Not, in any case, to attempt to deliver
-        to them (since that would be pointless anyway).  Whether or not
-        a valid address can subsequently be extracted from such an
-        address falls outside the scope of this standard (obviously,
-        posters wishing to disguise their address need to do more than
-        just add ".invalid" to it).
-
-        Be warned, however, that some injecting agents which are unable
-        to detect that the address belongs to the poster may choose to
-        insert a Sender-header (but see 8.2.2) or some entry in an
-        Injector-Info-header (6.19) which discloses some valid address
-        for the poster.
+        used for sending email (see 4.2.2).  When, for whatever reason,
+        a poster does not wish to use a valid address, the mailbox
+        concerned SHOULD end in the top level domain ".invalid" [RFC
+        2606].