2 Email Addresses On The Same Domain But Using Different Mail Servers

I'm trying to see if it's possible to have 2 email addresses on the same domain (e.g. email1@domain.com and email2@domain.com) but are handled by 2 different email servers (e.g. mail.domain1.com and mail.domain2.com)?

To put it into context, I have a domain hosted on my dedicated server and a couple of email accounts set up on it. I also have another mail account set up on a different server but with the same domain. I was wondering if maybe something could be done with the DNS to allow the 'external' mail account to be handled by the other server?