RE: address with brackets
- From: "Mark Fugatt" <mark@xxxxxxxxx>
- To: "'[ExchangeList]'" <exchangelist@xxxxxxxxxxxxx>
- Date: Mon, 15 Sep 2003 14:57:24 -0400
I would recommend taking a look at this RFC:
http://www.faqs.org/rfcs/rfc2821.html
Mark Fugatt
MCT, MCSE, Microsoft Exchange MVP
Pentech Office Solutions Inc
Tel: 585 586 3890
Cell: 585 576 4750
Fax: 585 249 0316
www.4mcts.com
www.exchangetrainer.com
-----Original Message-----
From: Mulnick, Al [mailto:Al.Mulnick@xxxxxxxxxx]
Sent: Monday, September 15, 2003 12:06 PM
To: [ExchangeList]
http://www.MSExchange.org/
I'm starting to wonder if I'm reading the same RFC :)
I see this part of the RFC :
6.2.3. DOMAIN TERMS
A domain-ref must be THE official name of a registry, network,
or host. It is a symbolic reference, within a name sub-
domain. At times, it is necessary to bypass standard mechan-
isms for resolving such references, using more primitive
information, such as a network host address rather than its
associated host name.
To permit such references, this standard provides the domain-
literal construct. Its contents must conform with the needs
of the sub-domain in which it is interpreted.
Domain-literals which refer to domains within the ARPA Inter-
net specify 32-bit Internet addresses, in four 8-bit fields
noted in decimal, as described in Request for Comments #820,
"Assigned Numbers." For example:
[10.0.3.19]
Note: THE USE OF DOMAIN-LITERALS IS STRONGLY DISCOURAGED. It
is permitted only as a means of bypassing temporary
system limitations, such as name tables which are not
complete.
The names of "top-level" domains, and the names of domains
under in the ARPA Internet, are registered with the Network
Information Center, SRI International, Menlo Park, California.
And especially notice the NOTE section which strongly discourages the use of
domain literals. I have to question the use of that by any
blacklist/blocklist/blockhead that says you have to have one of those,
especially since that concept doesn't really scale well, does it? Multiple
MX records are needed and if DNS is inoperable, then I suppose that reverse
DNS checks would also be broken, right?
I'm not trying to rant about this, but it makes no sense!! What is the
value of a domain-literal/implicitly defined FQDN for host delivery? Better
yet, is that not a bigger problem to specify such a thing with little
return? I'd have to give away half the addresses (which arguably should be
public, but the situation is if DNS is down). I think that the further use
of the RFC which says that you should be able to fall back to trying an A RR
for a domain is a far better use of the system than is domain-literal
acceptance.
Al
-----Original Message-----
From: Mark Fugatt [mailto:mark@xxxxxxxxx]
Sent: Monday, September 15, 2003 10:27 AM
To: [ExchangeList]
Subject: [exchangelist] RE: address with brackets
http://www.MSExchange.org/
Here is a link that should help you out: http://tinyurl.com/g8vq
Mark Fugatt
MCT, MCSE, Microsoft Exchange MVP
Pentech Office Solutions Inc
Tel: 585 586 3890
Cell: 585 576 4750
Fax: 585 249 0316
www.4mcts.com
www.exchangetrainer.com
-----Original Message-----
From: giordanocontigiani@xxxxxxxxxxxxxxxxx
[mailto:giordanocontigiani@xxxxxxxxxxxxxxxxx]
Sent: Saturday, September 13, 2003 3:48 AM
To: [ExchangeList]
http://www.MSExchange.org/
RFC 822 require that SMTP server accept addres like "name@[1.2.3.4]", where
mail domain is a dtext within brackets. My exchange 2000 server dont accept
this type of address (there is a manner to configure this?), second question
outlook client dont permit to send to this address (outlook express permit
it) thanks for any info regards giordano contigiani sys admin
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