Same situation and attitude on my part. It doesn’t happen often, but when someone is not getting my email (usually hotmail or some other garbage provider) I tell them to complain to their email provider or get a new one. My mail is going out, my server logs show everything is OK, and I will not jump through hoops to prove that I am not a spammer (I already jumped through the DKIM, etc. hoops).

>If an airline cancels my boarding pass because they don't like my email address (?), too bad for them, they just lost a sale.

Trust me, they don't care, I say this from experience. They don't seem to even have insight into these bans or the volume they're happening in. I had to spam Amazon support on and off for two years to get my account unlocked. And we all know how much Amazon cares about the customer... pah.

Standing your ground as a customer doesn't do anything but make life a misery.

On the other hand, if you lose a sale because of lost emails, that's annoying...

> If an airline cancels my boarding pass because they don't like my email address (?), too bad for them, they just lost a sale.

Sure but now you can't get home. I travel a ton, and this would be a major issue for me. You can't always just get on a different plane. Lucky you i guess, but airlines are one of those things that most people can't mess with.

> too bad for them, they just lost a sale

I think it's delusional to think they care any more than you do.