Re: Senders email address - Administrator@[IP Address of Server]
- From: "Sanford Whiteman" <swhitemanlistens-software@xxxxxxxxxxxxxxxxxxxxx>
- Date: Sun, 10 Feb 2008 18:33:41 -0500
When messages are sent out via a smarthost they get bounced back by
the recipients mail system. The error says the senders address is
"administrator@xxxxxxxxxxxxx" - the ip address is the address of the
2003 server.
You aren't providing adequate information about both systems (MUA's
SMTP server, SMTP server's next-hop smarthost) and both messages
(outbound message and returned DSN) for me to make a proper diagnosis.
With what little you've posted, I can only tell you the following: the
sender address is the RFC 821 protocol-level MAIL FROM:, as opposed to
the RFC 822 From: header. If you are seeing an unexpected domain in
sender addresses, this is usually because you have submitted mail
without a domain. Mail servers that don't reject MAIL FROM:
<administrator> outright will append their own hostname, creating
<administrator@xxxxxxxxxxxxxxxxxxxxxx>. In rarer cases, you will see
something like <administrator@xxxxxxx> where 1.2.3.4 is the
mailserver's or submitting MUA's IP address. In both cases, the root
problem is that you submitted mail without a domain. Don't worry about
how the mailserver tried to "fix up" the problem; worry about solving
the problem by submitting mail from a properly configured client.
...the "from" address of the email message...
The DSN, you mean?
is shown as postmaster@xxxxxxxxxxxx - where mydomain is the fully
qualified domain name set out in the delivery tab under IIS.
Nothing surprising about that, as that is the default postmaster
address used to send DSNs.
I need to understand why the senders address exists and where is it
specified?
_Why_ it exists? Because that's how SMTP works. Where? In your MUA
(mail user agent, i.e. client software). A generic end-user MUA sets
the RFC 821 MAIL FROM: (sender) and the RFC 822 From: to the same
address. However, more robust MUAs and SMTP client components allow
you to set these two separately... which is a fine, often mandatory,
level of flexibility, but not so fine if you don't know your way
around SMTP.
--Sandy
------------------------------------
Sanford Whiteman, Chief Technologist
Broadleaf Systems, a division of
Cypress Integrated Systems, Inc.
------------------------------------
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