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Date:	Fri, 12 Sep 2003 19:26:36 PDT7
From:	"Dr. Jeffrey Race" <jrace@attglobal.net >
Reply-To:	scoug-help@scoug.com
To:	< "scoug-help@scoug.com" > scoug-help@scoug.com >
Subject:	SCOUG-Help: HOST command ?

Content Type: text/plain

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On Fri, 12 Sep 2003 10:42:57 PDT7, Peter Skye wrote:

>sending to webmaster@ but have never heard of postmaster@ -- who

II. postmaster@domain

which RFC requires the address be implemented?

-RFC 2821 (new) (see below)

-RFC 1173 <http://sunsite.cnlab-switch.ch/ftp/doc/standard/rfc/11xx/1173>,
Responsibilities of Host and Network Managers.

-RFC 2142 <http://sunsite.cnlab-switch.ch/ftp/doc/standard/rfc/21xx/2142>,
Mailbox names for common services, roles and functions.

[JR Note: RFC822 is in \archive.zip

Note: RFC822 requires all domains exchanging e-mail to have a
address which is to be read by a person. RFC2142
states they SHOULD have an address.

-RFC822:

6.3. RESERVED ADDRESS

It often is necessary to send mail to a site, without know-
ing any of its valid addresses. For example, there may be mail
system dysfunctions, or a user may wish to find out a person's
correct address, at that site.

This standard specifies a single, reserved mailbox address
(local-part) which is to be valid at each site. Mail sent to
that address is to be routed to a person responsible for the
site's mail system or to a person with responsibility for general
site operation. The name of the reserved local-part address is:

Postmaster

so that "Postmaster@domain" is required to be valid.

Note: This reserved local-part must be matched without sensi-
tivity to alphabetic case, so that "POSTMASTER", "postmas-
ter", and even "poStmASteR" is to be accepted.

This standard specifies a single, reserved mailbox address (local-part)
which is to be valid at each site. Mail sent to that address is to be
routed to a person responsible for the site's mail system or to a person
with responsibility for general site operation.

Date: Thu, 21 Sep 2000 19:10:30 -0700
From: Steve Lamb
To: "Dr. Jeffrey Race"
Subject: Re: Postmaster

On Thu, Sep 21, 2000 at 09:29:01PM +0700, Dr. Jeffrey Race wrote:
> I thought it was 2142 that required . Is this so and
> if so how does 822 relate to it?

How it relates are stated in the rational in RFC2142. Other documents
require certain addresses for services, 2142 is taking thoes addresses and
aggrigating them into a single location. The requirement still comes from
822. ;)
Steve C. Lamb
-------------------------------+---------------------------------------------

RFC-2821 says:

Any system that includes an SMTP server supporting mail relaying or
delivery MUST support the reserved mailbox "postmaster" as a case-
insensitive local name. This postmaster address is not strictly
necessary if the server always returns 554 on connection opening (as
described in section 3.1). The requirement to accept mail for
postmaster implies that RCPT commands which specify a mailbox for
postmaster at any of the domains for which the SMTP server provides
mail service, as well as the special case of "RCPT TO:"
(with no domain specification), MUST be supported.

SMTP systems are expected to make every reasonable effort to accept
mail directed to Postmaster from any other system on the Internet.
In extreme cases --such as to contain a denial of service attack or
other breach of security-- an SMTP server may block mail directed to
Postmaster. However, such arrangements SHOULD be narrowly tailored
so as to avoid blocking messages which are not part of such attacks.

RFCs
Complete index http://www.cis.ohio-state.edu/htbin/rfc/
Searchable (by number or keyword) http://www.tohuku.ac.jp/RFC.html

http://sunsite.cnlab-switch.ch/ftp/doc/standard/rfc

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