Question: I'm at a loss as to how I should title this. I have this sentence:

> 
> We have the option to provide notifications via 
>  telephone, and, possibly, email.
> 
> 
> 

I am trying to express several things:

1. We have an option to provide notifications
2. We can provide
those notifications via telephone
3. I think we can provide email
notifications (Further research is required, but I believe the
audience already has that context. The addition of "possibly" is
primarily meant to emphasize the lack of a guarantee).

Would I be better off with this:

> 
> We have the option to provide notifications via telephone, and possibly, email.
> 
> 
> 

or this:

> 
> We have the option to provide notifications via telephone and, possibly email.
> 
> 
>

Answer: 
I would suggest using no commas at all. I think it's cleaner, and not ambiguous:

> 
> We have the option to provide notifications via telephone and possibly email.
> 
> 
> 

The other two acceptable choices that you have are (1) a comma right before *and*, and (2) commas around the *possibly*. The first choice would make the email option sound further removed from the phone option (try pausing there when saying it aloud):

> 
> We have the option to provide notifications via telephone, and possibly email.
> 
> 
> 

The second choice would look like this, and would draw some attention to the word *possibly*:

> 
> We have the option to provide notifications via telephone and, possibly, email.
> 
> 
> 

But all three commas together, though grammatically acceptable, merely comprise clutter (*telephone, and, possibly, email*) and should be avoided.
Oxford commas give me a headache. My feeling is that "possibly" does not need to be offset under these circumstances, therefore I would put "We have the option to provide notifications via telephone, and possibly via e-mail." 

However, I'm old, and still view the Oxford Comma as optional.