Fair comment. But that issue is pretty simple: there is no good reason for them to fail to deliver email under any circumstances. (This has happened to me too -- someone tried to email my gmail account and gmail completely refused to deliver it. It was pretty embarrassing.)

Messages they think you won't want to receive are what the spam folder is for.

"fail to deliver email under any circumstances."

The amount of spam that would be delivered if they didn't discriminate AT ALL is enormous.

They have to read all this feedback and discriminate better.

> there is no good reason for them to fail to deliver email under any circumstances

Yes there is. They don't want to carry traffic from anybody from the major email blacklists. If a mail server is on a real, very transparently-managed blacklist, no large provider should be accepting their smtp traffic.

Yet all the people here trying to administrate servers from residential and VPS blocks of IPs are telling you they're caught up in this list you're lauding as all-knowing and safe.......