6
Actually one last thing that might help you pinpoint the problem.
I did receive a correct mail (as webmaster) that harry has registered (although he did not click on the activation link).
I also got a Undelivered Mail Return to Sender message for the mail that was to be sent to Harry.
This was the error :
I'm sorry to have to inform you that your message could not be be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to <postmaster>
If you do so, please include this problem report. You can delete your own text from the attached returned message.
The Postfix program
<chco@casema.nl'>: bad address syntax: "chco@casema.nl'"
<'@node15.cluster.nxs.nl> (expanded from <'>): unknown user: "'"