Anybody else misses emails in gmail?

Anybody else misses emails in gmail?

Lots of times gmail just won't accept an email.
Those emails just do not get delivered, nor do they get bounced back.
They just disappear. They are in none of the folders in gmail.
I used to think that this is only from servers where mail servers are not configured properly, or from black listed IPS.
But recently gmail even rejected emails from facebook.
Has this happened to anyone else?

I had a secondary fb account, and I login to that once a week or...

Anybody else misses emails in gmail? WordPress ...