Was helping a guy having trouble posting to our LUG list the other day.
He had DSN's being delivered to his GMail spam folder. I thought, "golly, how does Gmail figure those could be spam?" Nobody is going to sneak a Viagra ad through underneath a 550 report.
Of course his other problem was he was using Comcast as an outbound relay. Their new relay retries a message once every second five times and then gives up forever. Totally breaks greylisting, or even temporary outages. Didn't even try my backup MX.
But I'm running RFC-complaint secure servers, so those two big bozos can go pound sand. Eventually they'll fix their game. If a LUG member, of all people, can't be bothered to spend $2 a month for quality email hosting (assuming they just don't want to do their own), I'm not going to cry about it.
Free services are only guaranteed to be worth just as much as you pay for them. This falls squarely into the "not my circus, not my monkeys" category.