elstar.com.au

Posted: **Wed Jan 14, 2009 7:00 am**

When a user sends an email to a particular user the email is rejected with smtp;550 Access denied - Invalid HELO name
bern-pc is the local pc name

notes:- From the Delivery Status Notification (DSN)
The Reporting-MTA: is the local PC
Received-From-MTA: is the local PC

the Reporting-MTA
is the MTA that attempted to perform the delivery, relay, or gateway
operation
reporting-mta-field =
"Reporting-MTA" ":" mta-name-type ";" mta-name

mta-name = *text

The optional Received-From-MTA field indicates the name of the MTA
from which the message was received.

received-from-mta-field =
"Received-From-MTA" ":" mta-name-type ";" mta-name

Diagnostic-Code: smtp;550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1)

This is the RFC2821 manual
http://rfc-ref.org/RFC-TEXTS/2821/contents.html

Extended HELLO (EHLO) or HELLO (HELO)

These commands are used to identify the SMTP client to the SMTP server. The argument field contains the fully-qualified domain name of the SMTP client if one is available. In situations in which the SMTP client system does not have a meaningful domain name (e.g., when its address is dynamically allocated and no reverse mapping record is available), the client SHOULD send an address literal (see section 4.1.3), optionally followed by information that will help to identify the client system.
4.1.3. Address Literals

Sometimes a host is not known to the domain name system and communication (and, in particular, communication to report and repair the error) is blocked. To bypass this barrier a special literal form of the address is allowed as an alternative to a domain name. For IPv4 addresses, this form uses four small decimal integers separated by dots and enclosed by brackets such as [123.255.37.2], which indicates an (IPv4) Internet Address in sequence-of-octets form.

This is the DSN Delivery Status Notification

-----Original Message-----
From: postmaster@bern-pc [mailto:postmaster@bern-pc]
Sent: Monday, 12 January 2009 12:27 PM
To: bern@mydomain.com
Subject: Delivery Status Notification (Failure)

This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.

jam@xtension.com.au

Reporting-MTA: dns;bern-pc
Received-From-MTA: dns;bernpc
Arrival-Date: Mon, 12 Jan 2009 12:26:48 +1000

Final-Recipient: rfc822;jam@xtension.com.au
Action: failed
Status: 5.0.0
Diagnostic-Code: smtp;550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1)

Code: Select all: # telnet mail.bigpond.com 25 Trying xxx.xxx.xxx.xxx... Connected to mail.bigpond.com (xxx.xxx.xxx.xxx). Escape character is '^]'. 220 realname.ISP.fr ESMTP Postfix EHLO bern-pc 250 realname.ISP.fr MAIL FROM: bern@mydomain.com 250 Ok RCPT TO: jam@xtension.com.au 250 Ok DATA 354 End data with <CR><LF>.<CR><LF> Subject: test telnet+HELO+MAIL+RCPT+DATA Test 5 . 250 Ok: queued as 1BBA025602 QUIT 221 Bye Connection closed by foreign host.