[TYPO3-english] HTML mail template ignored in srfeuserregister

[Jeroen Visser | ROQUIN E-Solutions]

Hi,
When subscribing to a website I want to use the EMAIL_TEMPLATE_SETFIXED_CREATE_HTML template in tx_srfeuserregister_pi1_css_tmpl.html
In my constants I have set: plugin.tx_srfeuserregister_pi1.enableHTMLMail = 1

Only plain text mail is send. Can someone tell me what I have to set more?

Thanks in advance.

Kind regards,
Jeroen