Newsfeed notification email opened with Lotus Notes have different interpretation

We have a SharePoint 2013 on-premise farm. When someone post a Newsfeed with @tag, SharePoint will send out a notification email. When open the mail with Notes, the email contains a link like this:

http://ift.tt/1LxAGGv

they click on the "name" with links will result in bad link error. It is because the slash "/" is wrong. The correct slash should be "\".

When we save the email as eml file. Then open the eml file with Outlook. The same link become:

http://ift.tt/1DMxnMw\userID

Anyone have simliar issue before?