We currently have CRM 2015 and Exchange 2010 on prem. We have configured server side sync, everything is working fine.

We are migrating to Office 365 BUT leaving CRM 2015 on prem.

Is it possible to have this deployment allowing email to be sent from CRM (1 or 2 accounts send email out) on Prem to exchange online

I have found a few articles stating yes but they have been for 2016.