Take a look at the first section on http://spark.apache.org/community.html. You basically just need to send an email from the aliased email to user-unsubscribe@spark.apache.org. If you cannot log into that email directly, then I'd recommend using a mail client that allows for the "send-as" functionality (such as Gmail).

On Mon, Feb 1, 2016 at 4:38 PM, Eduardo Costa Alfaia <e.costaalfaia@unibs.it> wrote:
Hi Guys,
How could I unsubscribe the email e.costaalfaia@studenti.unibs.it, that is an alias from my email e.costaalfaia@unibs.it and it is registered in the mail list .


Eduardo Costa Alfaia
PhD Student Telecommunication Engineering
UniversitĂ  degli Studi di Brescia-UNIBS

Informativa sulla Privacy: http://www.unibs.it/node/8155