Thanks for your quick response, Will.
I'm switching to dreamhost after serving both my mail and web needs on a server I've been running on my static IP DSL line at home for about two years, so please bare with me as I let go of things that I used to have more control over!
In the long run, I have no problem with moving my DNS hosting to dreamhost, it's more of a short term concern. I'm worried about having to wait the week or so for the new DNS servers to be propagated throughout the internet, and in the mean time some of my email will still be hitting my server on my DSL line, and some of it will going to dreamhost. To complicate matters, I'm headed out
of town for 10 days next week, and I don't want to have to stress out about my email bouncing for some reason. So, I guess I just have some paranoia built up.
I was thinking of two possible solutions:
1) I could configure the MX record at zoneedit (my current hosting solution) to be whatever dreamhost wants it to be, and thus while I'm waiting for the DNS servers for my domain to switch over, mail should be delivered only to dreamhost.
2) I could configure the MX record at dreamhost to point to my existing mail server, and then after all the DNS name server propagation has taken place, I could switch the MX record to point to dreamhost mail hosting.
I guess I'd prefer option 1 so that I can start using dreamhost for my mail right away. Do you know what the mx record entry should be for me to do this?