Yes, but not for long. Migrating to a self-hosted mail server is one of my top priorities [1] for 2013. [1] - http://www.slate.com/blogs/future_tense/2013/03/26/andrew_we...
I'm highly interested in doing the same, can you recommend any resources that describe the process of setting up a self-hosted mail server?
Here is one with virtual domains, etc. might be overkill for your usecase though.
http://workaround.org/ispmail/squeeze
I personally run a stack over courier and some other hacks ontop of rdeliver, which works really nicely.
Important: Please always make sure to check that you don't run an open relay.