Attention! We urgently recommend you not to use emails of these mail servers:
... @AOL.com ... @yahoo.co.jp ... @fuse.net ... @web.de ... @gmx.de ... @netcologne.de ... @prodigy.net ... @sbcglobal.net ... @comcast.net ... @att.net ... @bellsouth.net
Not all the emails is delivered to them, some answers and orders are lost.
We recommend to use any other mail server for contacts and orders!