I’m specifically thinking about emails I receive all day where someone will write:

> 
> Haven’t seen it yet. Will respond when received.
> 
> 
> 

If it were spoken, we would certainly hear:

> 
> I haven’t seen it yet. I will respond when I receive it.
> 
> 
> 

It’s mostly the dropping of *I* that I wonder about. Is there a name for this phenomenon?