A Google search on this topic lead me to some instructions that don't work for me - since all
http://www.facebook.com/mobile/ are redirected to
Facebook Home site.
How can I do it now?
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For modern browsers and smartphones Facebook prefers that you upload directly or using an App than post-by-email. So, if you use a modern browser FB will hide the address from you.
You either need to use an old browser or user agent switcher and then the instructions will work. See http://www.devineprojects.org/blog/archives/2013/07/updated-how-to-find-your-facebook-post-by-email-address-and-post-from-google/ and http://hackingbuzz.com/update-facebook-status-via-email/
The feature appears to be "phased out" and "dropped from the faq". Refer to https://www.facebook.com/help/community/question/?id=10206665176571297 and https://www.facebook.com/help/community/question/?id=981476835197502
In my experience messages to the "post by email" address have returned a Delivery Status Notification (Failure) after 3 days.