[Dovecot] Send and Bounced mail not appearing, depending on mail client

Hi,

I just installed Dovecot2 on Ubuntu 12.04 server with postfix and postfixadmin. I am using virtual users and virutal domains. When using Thunderbird, Roundcubemail,iOS mail application on an iPad2 or Kmail n Android, all mail sent and bounce shows up.

However, when using vTigerCRM to send mails, nothing shows up - anywhere. I know the mail are being send - as per the mail.log and the various postfix log lines. But none of that is being captured by Dovecot...

What am I missing?

Thanks for any hints you can provide.

Dominique

This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com