> Those are obligations for web sites. But what about a mail sending domain > without web site ?
As far as I'm aware there is no obligation (by law) to provide a website with legal info for e-mail only domains. Companies in Germany are required to include that information inside *every* email anyway (usually in footer). T-online wants to know your mailserver's ip addresses, checks matching forward/reverse dns and (usually) a website within your mailserver's domain with legal info - this is all about your mailserver. You do not have to provide this info for customer domains relayed through your mailserver. Best regards Gerald