Finally, I was able to nail down the PBL problems I had with my qmail server. I was able to use Outlook 2007/2003 to use my pop/smtp. To use Outlook 2007, you should have the ff settings:

  1. Tools -> Account Settings.
  2. Click on the desired account
  3. Click on “More Settings” button
  4. In the outgoing server tab, ensure that you have “My outgoing server (SMTP) requires authentication” checked.
  5. In the outgoing server tab, ensure that you have “Use same settings as my incoming mail server” checked.
  6. In the Advanced Tab, you can set it to “Auto”

**Spamhaus problem. 451 http://www.spamhaus.org/query/bl?ip=219.142.133.68. **
You can remove spamhaus when you send email, but that’s quite dangerous. If you want to completely remove the PBL checking,

  1. Check your blacklist settings. You can remove the line below, or change it to an PBL listings like http://forum.qmailrocks.org/archive/index.php/t-3103.html
more /var/qmail/control/blacklist
-r sbl.spamhaus.org
  1. Restart qmail
/etc/init.d/qmailctl stop
/etc/init.d/qmailctl start

553 sorry, that domain isn’t in my list of allowed rcpthosts (#5.5.3 – chkuser)
Here’s a good description of the problem on relaying. http://www.palomine.net/qmail/relaying.html
. If you “enabled smtp authentication” and used your settings for loggin-in, then this would not happen. I experienced this when I changed my Outlook 2007 settings to “Log on to incoming mail server before sending mail”.

References: http://www.peternew.co.uk/?p=85
http://www.spamhaus.org/sbl/howtouse.html