[Info-vax] Decuserve.org - Anyone know why it's down?

[Bill Gunshannon]

In article <54abe73d$0$32946$c3e8da3$12bcf670 at news.astraweb.com>,
	JF Mezei <jfmezei.spamnot at vaxination.ca> writes:
> On 15-01-06 08:16, Bill Gunshannon wrote:
> 
>> But people should realize, places that accept email from sites who's
>> A Record and PTR Record do not match are mis-configured. 
> 
> Nop.
> 
> Consider one of the large ISPs in Canada (Rogers). They have outsourced
> email to Yahoo.  So a may from name at rogers.com is actually processed and
> then sent by a server whose reverse translation points to a Yahoo.com host.

From: address has niothing to do with any of this.  rogers.com is not
what gets sent in the HELO command. rogers.com is in an MX mapping it
to an A record.

Doesn't mean they did it right, but your understanding of how it works
is wrong.

> 
> Bell Canada, not to be outdone, outsoruced its mail to microsost/hotmail
> (or whatever it is called this week)

bell.ca mail exchanger = 10 cluster3.eu.messagelabs.com.
bell.ca mail exchanger = 20 cluster3a.eu.messagelabs.com.

> 
> On a more concrete example:
> 
> from jdoe at ibm.com   will likely be processed by a server whose IP
> address is reversed translated to mta3872.ibm.com but whose helo may be
> mta.ibm.com

take your pick:

ibm.com mail exchanger = 10 e32.co.us.ibm.com.
ibm.com mail exchanger = 10 e35.co.us.ibm.com.
ibm.com mail exchanger = 10 e4.ny.us.ibm.com.
ibm.com mail exchanger = 10 e33.co.us.ibm.com.
ibm.com mail exchanger = 10 e31.co.us.ibm.com.
ibm.com mail exchanger = 10 e5.ny.us.ibm.com.
ibm.com mail exchanger = 10 e3.ny.us.ibm.com.
ibm.com mail exchanger = 10 e6.ny.us.ibm.com.
ibm.com mail exchanger = 10 e34.co.us.ibm.com.
ibm.com mail exchanger = 10 e1.ny.us.ibm.com.
ibm.com mail exchanger = 10 e2.ny.us.ibm.com.


> 
> This is why SPF records exist, to list the hosts authorized to send mail
> on behalf of a domain.

And MX records.  But that still has nothing to do with HELO, SMTP or
spoofing.  

bill

-- 
Bill Gunshannon          |  de-moc-ra-cy (di mok' ra see) n.  Three wolves
billg999 at cs.scranton.edu |  and a sheep voting on what's for dinner.
University of Scranton   |
Scranton, Pennsylvania   |         #include <std.disclaimer.h>