Hi ALL,
I have managed to resolve this - I had put the wrong entry under Admin>Sysconfig>Framework>Core::Sendmail::SendmailNotificationEnvelopeFrom


From: Michael Mayaka <mikemayaka@yahoo.co.uk>
To: otrs@otrs.org
Sent: Tue, 31 August, 2010 9:02:11
Subject: Auto-response Queue

Hi ALL,
I've been using OTRS 2.4.7 for a while and all has been fine. I have setup a replica on Solaris 10; problem is, the auto-response isn't working. I am able to receive e-mail tickets and send out mail (Admin Notification). When A ticket is received, the system shows an auto-response - system (email-external) - has been sent. BUT the customer receives no auto-response...what did I miss out?
 
Rgds,
Michael