@douwe_yntema - It depends on the mail client receiving the mail.
It wil only work with HTML mails
These must set up properly,with <head> tag's etc. Just like a website
That's all well and good but as far as I know there is no way (or place in the system files), to change/modify the sent email from the registration system. If you know where please tell me. On the other hand I use Thunderbird exclusively as my email client. I have 13 email addresses configured and they all work fine. They are all configured to receive and send html emails. I found an old email in one of my inboxes that had an activation email. After opening it (non-clickable url) I clicked View/Message Body and selected Plain Text and lo and behold the url became clickable. This I do not understand as it seems to be just the opposite of what you would expect to see. GO FIGURE!!
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