Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
in proving the service of any notice via email , it will be sufficient to prove that such e-mail was sent to the specified e-mail address of the addressee . 

```
. OPTIONS: ["Arbitration", "Choice of law", "None", "Unilateral change", "Contract by using", "Unilateral termination", "Content removal", "Limitation of liability", "Jurisdiction"].