Using Mpix to print a large photo

I have a landscape photo that currently is 3264X2448 pixels which will print at 300 pixels per inch (photoshop says).

I want to upload this to Mpix and have a print made at about 20X30 inches.

My question: should I resize the image in PS3 first then upload to Mpix or when you get a print that size from them do they resize the image (interpolate) or do they just enlarge and print?

Thanks

It's been a while since I ordered anything that large from Mpix, but I seem to recall something about 100ppi being the minimum they need for a decent print. Your image would be within the minimum of 3000x2000 for a 30x20.

When I ordered some large prints, I did the enlarging myself and I was pleased with the results. I've heard of others saying "just send it...they'll do a good job."

Hope this helps...

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Thanks guys!