Unable to change SMTP server setting

2 msg	Recipient address rejected: User unknown in loc...
1 msg	Injecting headers into a database
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Unable to change SMTP server setting
\ Bret Busby (11 Mar 2008)
. \ Evan Platt (11 Mar 2008)
. \ Brian Evans (11 Mar 2008)
. \ (Wietse Venema) (11 Mar 2008)
. . \ Bret Busby (12 Mar 2008)
. . . \ Victor Duchovni (12 Mar 2008)
. . . . \ Bret Busby (12 Mar 2008)
. . . . . \ (Wietse Venema) (12 Mar 2008)

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Subject:	Unable to change SMTP server setting
Group:	Postfix-users
From:	Bret Busby
Date:	11 Mar 2008

Hello.

We have recently changed our ISP that provides Internet access, and thus
require to change the SMTP server setting in Postfix, to be able to
send out mail using our mail server.

The only way that I can find to do this, is, using the Postfix book by
Kyle Dent (Postfix: The Definitive Guide, O'Reilly, 2004), on pages
110-111, is reference to "Outbound mail relay", which involves changing
the parameter relayhost in main.cf, then running "postfix reload".

I have changed that parameter, to the new SMTP server, first commenting
out the old SMTP server and inserting the text line containing the name
of the new SMTP server, and running "postfix reload".

That did not work; mail was still sent to the old external SMTP server,
and bounced.

So, I deleted the commented out text line, and again ran "postfix
reload".

That didn't work, so I rebooted the mail server.

That didn't work; the email message that I was trying to send, was still
sent to the old external SMTP server, and bounced.

Can the external SMTP server setting be changed in Postfix?

I cannot find how to do it, which means that, until I can find how to
do it, we can no longer use Postfix to send outgoing email.

Thank you in anticipation.

--
Bret Busby
Armadale
West Australia
..............

"So once you do know what the question actually is,
you'll know what the answer means."
- Deep Thought,
Chapter 28 of Book 1 of
"The Hitchhiker's Guide to the Galaxy:
A Trilogy In Four Parts",
written by Douglas Adams,
published by Pan Books, 1992

....................................................