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Thanks for taking your time (special nod to you trabis).
Sorry for not being clear enough, but I know I have to change the templates to actually use it. The problem is that when I do that (i.e. try to use it by adding |xoEmail) I get the error message which I described in the first post.
So, it seems to me that when I try to call the xoEmail function, it fails to load it and I can't figure out why.
Edit: OK, I found the reason. When I unpacked the files, the permission was automatically set to Read for all users. I manually changed the permission to read&writ and that did it. Anyone care to give a brief explanation as to why it's necessary to also have write acess (these files are not modified by the system, are they?)?
Anyway, thank you Ghia and trabis for your efforts.