All emails sent to and from your synced Gmail account - whether sent from aliases or forwarded from other email addresses - will show up in KIZEN.
If you have your Main Email Address, Alias 1, and Alias 2, you will be able to see that level of detail on the contact record timeline.
Let's say you send an email from Alias 1 to a contact. On the contact record of the recipient of the email, you will see Email sent from Alias 1 on the timeline. When you click View Email you'll be able to see the exact emails involved in the exchange.