Share page by email doesn't work when browsing the wiki using an IP address

When trying to share a wiki page by email 'Sender Email Address' is set to: $!

{request.localName}

#set ($sender = $xwiki.getUserName($context.user, false))
#set ($sender = "$sender <noreply@$!{request.localName}

>")

It should be set to: $!

{request.serverName}

The same for body email content:

Hello ${recipientName},

${xwiki.getUserName($context.user, false)} thought you might be interested in the document "$!{escapetool.xml(${doc.displayTitle})}" (${doc.getExternalURL()}) on ${request.getLocalName()}.

${request.getLocalName()} must be replaced with $!{request.serverName}