2004 Mercury Mountaineer hold in muffler?

I own a 2004 Mercury Mountaineer (which should be identical to a 2004 Ford Explorer in many aspects). I noticed a leak underneath the car today while it was running, and noticed a hole in the anterior (towards the front of the car) of the muffler. It is very small and appears to be directly below the input. Is this is a problem, or is it how it should be (came from the factory that way).

I ran the car in the rain this morning for a few minutes, and then parked the car for a few hours and the weather proceeded to be sunny and in the 80's, if this has anything to do with it.

Attached is a picture of another muffler that looks like the same, but from a different manufacturer
2004 Mercury Mountaineer hold in muffler - 1

Drain hole for condensation. Lots of water in gasoline exhaust vapors. Better to drain a muffler than to have it rust from the inside out.

Just a weep hole for condensation.