We are in the process of moving our website to a new domain i.e oldsite.com to newsite.com

As part of this ur email address will be changing from hello@oldsite.com to hello@newsite.com

We set up the new domain and email address in zoho. We've se the new address as the primary email address and the old one as an alias.

What we would like to happen is that is someone emails hello@oldsite.com it would automatically deliver it to hello@newsite.com.  This way when we reply to the email address it will automatically reply from hello@newsite.com

Our problem at the moment is that if someone emails the old address then by default the reply will come from the old address as well. 

Is this possible?