Forum OpenACS Development: Re: ad_proc [cc_email_user] returns blank
1) you should replace deprecated calls by non-deprecated calls. Nobody will fix deprecated calls. OpenACS warns you, when you use deprecated calls.
2) parameter::get_global_value is not really new, it was introduced in 2010 
I knew about 2, but I didn't about 1! I should have looked at /api-doc in OpenACS.org, instead of my own box.
set user_id [cc_lookup_email_user $email]
There's a core change that must be applied.