X-Headers

created by brainwave

(thing) by brainwave (5.2 mon) (print) ? (I like it!) Fri May 18 2001 at 21:53:04

RFC1036 defines the Standard for Interchange of USENET Messages. The headers that are at the top of a USENET message are an important part of this definition. There are six headers that are absolutely required they are:

"From", "Date", "Newsgroups", "Subject", "Message-ID", and "Path".

There are thirteen headers that are standard but optional they are:

"Followup-To", "Expires", "Reply-To", "Sender", "References", "Control", "Distribution", "Keywords", "Summary", "Approved", "Lines", "Xref", and "Organization".

The interesting part is that the RFC also states that "Any unrecognized headers are allowed, and will be passed through unchanged." This allows users and people who implement news clients to extend the set of headers. An informal convention of placing "X-" for eXperimental before the non-standard headers evolved. Probably the two best known examples of X-Headers that have come into common use are X-Mailer and X-No-Archive. A check of 1617 articles in he newsgroup news.groups turned up the following list of non-standard USENET headers.

Answer:
Archive-Name:
CC:
Cache-Post-Path:
Cc:
Changes-posted-to:
Comment:
Comments:
Content-Disposition:
Content-Transfer-Encoding:
Content-Type:
Copyright:
Directory:
Email:
In-Reply-To:
In-reply-to:
Last-Modified:
Last-change:
Login:
MIME-Version:
Mail-To-News-Contact:
Mail:
Mark:
Mime-Version:
NNTP-Posting-Host:
NNTP-Posting-User:
Note:
Original-author:
Originator:
Posted-By:
Posting-Frequency:
To:
URL:
Version:
Web:
X-001:
X-002:
X-Access:
X-Address-Invalid:
X-Admin:
X-Advice:
X-Also-Approved:
X-Apparently-To:
X-Approved:
X-Article-Creation-Date:
X-Attribution:
X-Auth:
X-Authenticated-Sender:
X-Authenticated:
X-Bomb-Instructions:
X-Comment:
X-Content-Currency:
X-Copyright:
X-Details:
X-Face:
X-Geek-:
X-Geek-Code:
X-Geek:
X-Given-Sender:
X-HTML:
X-Home-Pages:
X-Homepage:
X-Http-User-Agent:
X-Incantation:
X-Junk-Policy:
X-Last-Updated:
X-Legal-Warning:
X-Mail-Policy:
X-Mail2News-Errors-To:
X-Mail2News-Info-Url:
X-Mail2News-Path:
X-Mail2News-User:
X-Mailer:
X-Marks:
X-Mayan-Date:
X-Meow:
X-NETCOM-Date:
X-NNTP-Poster:
X-NNTP-Posting-Host:
X-Newsposter:
X-Newsreader:
X-Nntp-Posting-Host:
X-Nntp-Posting-User:
X-No-Archive:
X-No-Junk-Mail:
X-Note:
X-Operating-System:
X-Origin:
X-Original-Message-ID:
X-Original-Newsgroups:
X-Original-Path:
X-Originating-IP-Addr:
X-PGP-Ox6E86B769:
X-Perfectly-Legal-To-Mention:
X-Posted-By:
X-Posted-For-Grubor-By:
X-Posted-From:
X-Posting-Agent:
X-Posting-Frequency:
X-Priority:
X-Received-On:
X-Robomod:
X-SCRM-Policy:
X-Sender:
X-Server-Date:
X-Sound-Advice:
X-Spam-Bait:
X-Spam:
X-Spambait:
X-Stanley-Cup-Champion:
X-To:
X-Trace:
X-URL:
X-Voice:
X-XS4ALL-Date:
X-XXDate:
X-XXMessage-ID:
X-easynet-cherry:
X-headers:
X-newsgroup:
X-rn/trn/strn-Killfile-Entry:
X-unsolicited-email:
X-windows:

List courtesy of Simon Lyall (simon@darkmere.gen.nz)

printable version
chaos

Determining if a linked list loops using only two pointers	Usenet Death Penalty	mail headers	How to create a Usenet newsgroup
X-Face	How to unsubscribe someone from a mailing list	X-Bomb-Instructions	How to decode email headers
RFC	xref	Oh, The Places You'll Go!	Header
Kibo	usenet

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