Jürgen,
I have never seen such a publication ad, nor heard of such a group (saphana.com). However, I seldom get such mails any more since I removed my real name from SCN and adopted a pseudonym.
The thing I find annoying is right after I attend any SAP school, 'somehow' my inbox becomes flooded with SAP-related junk mail (some from SAP but mostly from companies selling SAP-related products and services).
If SAP really sent this to you, not much you can do but unsubscribe. If it is anyone else, hope your antivirus software is up to date.
Sympathetically,
DB49