trigger-action: send an email to cck e-mail field

Hi!

My problem is how to automatically send an e-mail to an adress entered in a cck-email field.
On my site also guests are allowed to create own content, which will be published after being checked. These guests should receive an email (if they entered their adress in the cck field) with a link to their content, as soon as it is published.
By using trigger I can only send emails to "%author" or to a fixed Adress. I tried to enter the e-mail fieldname (e.g. "%node_email_field") here, but thats impossible...
Any suggestions for this problem?

Thx, chris