I have two accounts

mail1@mydomain.com

and

mail2@mydomain,com

I would like to set this up so that mail2@mydomain.com is also picked up by mail1@mydomain.com

but if the person using mail1@mydomain.com deletes an email for this to be replicated in mail2@mydomain.com account

Is this possible by setting up filters?  and using imap?

Thanks