Mail not allowed by smtp server

My mailserver is not allowing to send mail in 10.7.6 In 10.6.8 everything is fine.
I cannot find any solution on the net, nor what I can be doing wrong.
The provider has no answer ether. The server works fine (tested it with webmail and other computer)
Wonder what to throw away to let it work.(never worked before in 10.7.3)
Using older system for mail now, but like to switch to Lion.
regards, Erik

Thanks Glenn,
I found it. It seems my server did not like a password when sending mail. I did not send any password but somewhere in the system it got stuck. So I changed password in advanced settings to APOP. Then I good send 1 message to myself and on the way back to the computer it gave the error.Server thus not suppor password. So I flipt it back to password. And now I can send and recive. It thus not make sense to me but it seems to work. It took some hours. My mail provider is UPC with pop3 and smtp.
Regards, Erik

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I have muiltiple for gmail, telkom (My ISP) and work.
When I try it through gmail it worx but my ISP's smtp host still bounces the message:
Email recieved from [email protected]
[email protected] to me
show details 10:31 PM (10 minutes ago) Reply
Hi. This is the qmail-send program at telkomsa.net.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.
Your message was bounced by our server.
       If you have any other queries please contact our support:
TelkomInternet Support Desk Number: 10215
TelkomInternet Support Desk Mail: [email protected]
<[email protected]>:
Warning: undefined mail delivery mode: normal (ignored).
The users mailfolder is over the allowed quota (size). (#5.2.2)
--- Below this line is a copy of the message.
Return-Path: <[email protected]>
Received: (qmail 18884 invoked from network); 23 Nov 2008 20:31:06 -0000
Received: from unknown (HELO ironport1.telkomsa.net) ([xxx.xx.xxx.xxx])
         (envelope-sender <[email protected]>)
         by O (qmail-ldap-1.03) with SMTP
         for <[email protected]>; 23 Nov 2008 20:31:06 -0000
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: ArwAANpLKUlIDszicWdsb2JhbACSSlQ+AQwKCQkPBa47gQKJfAEDAQOCeQ
Received: from qb-out-0506.google.com ([72.14.204.226])
by ironport1.telkomsa.net with ESMTP; 23 Nov 2008 22:31:01 +0200
Received: by qb-out-0506.google.com with SMTP id f29so1924750qba.33
       for <[email protected]>; Sun, 23 Nov 2008 12:30:59 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
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        :mime-version:content-type:content-transfer-encoding:from:date;
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DomainKey-Signature: a=rsa-sha1; c=nofws;
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Cc: [email protected]
Message-ID: <8694729.0.1227472251250.JavaMail.NEIL@5200am2x64bit>
Subject: My First Email
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
From: [email protected]
Date: Sun, 23 Nov 2008 12:30:58 -0800 (PST)
- Show quoted text -
Hello this is a email

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Mail not allowed by smtp server

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