If i use "Send Page By Email" to notify somebody. The text shows 127.0.0.1 insted domain or wiki name.
The link himself is correct, with domainname and brings you to the right page if you click on it.
Alias under /xwiki/bin/view/XWiki/XWikiServerXwiki is set to https://wiki.domainname.de
We use a nginx reverse proxy and SSL so is set in the configfile xwiki.cfg