What didn't work so far:
- Sending an email to the exact page slug followed by @facebook.com
- Sending a message to an email from the page. The option is not available.
I'm looking for something similar to this but for pages:
Facebook never did offer @facebook.com email addresses to pages, only people, and that service was retired some months ago. (Email sent to firstname.lastname@example.org will get forwarded to your email address on file, at least for now.)
There used to be a feature to post to your Facebook Page via email, but that service, too, has been retired.