Anything from a Facebook domain hitting my mail server is bounces them back to Facebook's abuse and postmaster addresses. I know categorically that it is abuse, because I am the sole user of my mail server and do not now and have never had a Facebook account, and have repeatedly asked them in various ways to stop spamming me.
Useless, of course. But just because they ignore internet norms of decent behavior doesn't mean I will.
For what it's worth I have a Facebook account and have all the email notification settings off and can't remember seeing an email from Facebook in over a year.
I noticed that when I stopped checking my Facebook account, Facebook started sending me FOMO messages ("Hey! You have messages! People are saying things! Please come look!")
I noticed them doing that as well, and did what I usually do with companies that get too chatty: First, turn off the notifications, unsubscribe, etc. Then, if they ignore my preferences or keep adding new categories of notification that are enabled by default, I add a client-side rule to throw away everything they send. This way they get to keep thinking that I receive their spam, and I don't have to see it, which is a win-win (though a sad loss for email in general as an obsessively reliable communication system).
This worked out fine for Facebook: I visit their webpage when I want to know what's going on over there, and they never send me email.
Facebook's email messages used to be pretty useful; they used to contain the actual content of posts. That means if you also turn off remote images, you can actually read Facebook posts without Facebook having realized that you've read it. I've always done this for privacy, until they stopped putting the actual post in their emails.
Yes, but it also stops sending you normal e-mail notifications, which is IMHO only annoying because I prefer to use my e-mail client to read messages, invites, etc.
You'd probably have more luck marking them as spam in your client. If you're using a webmail service of any note, you're helping to train the filters used by others, and as a bonus, your own profile means you're less likely to get them in the inbox in the future.
Also, if you're in the USA, you should report those messages to the FTC.
You appear to have missed the part about this being my own mail server.
And I don't need any more luck; my initial problem is solved (I no longer see spam from Facebook, and I am taking steps to ensure they are aware of their problem, in case they weren't).
The problem was worth the time I spent on the config; it is manifestly a waste for me to involve the FTC, since I don't have to worry about Facebook's spam anymore and am willing to eat the tiny amount of bandwidth involved.
Thereby resulting in facebook being a worse software for the average user due to their abuse of this one user. Win win for someone who doesn't like facebook.
Useless, of course. But just because they ignore internet norms of decent behavior doesn't mean I will.