Why do Avira and Kasp ask fr my email?

I'm done with Norton 360 but these two ask for my email address. Am I required to give it to them and what happens after I cancel?
Why do Avira and Kasp ask fr my email?
Don't worry about giving Kaspersky your e-mail. If you don't want to be bothered with promotions they will give you the opportunity to reject it. Just click the right box. If you buy Kaspersky at a store like Wal Mart or Office Depot there will be a activation key with the disk. Just run the disk and follow the prompts.
Reply:I cant speak for Avira but Kaspersky send your activation





key by email and if you then buy it after the trial period they





will then send your license key by email.....this is the reason





and nothing to do with promotions or updates as said above.





These are two reputable companies both at the top of the





tree and they will not abuse your email.....and yes you will





have to give it to them...If your overly worried just make a





new email address specifically for these occasions.
Reply:most likely they ask for it because they want to send you newsletters which they have it is like a promotion thingy la or it is for updates but i dont think so you can cancal it anyway
Reply:Don't worry , its only to send you the activation key by e mail.


I got my activation key via e mail for Avast.