We used to find a lot of missing links in messages where ccTLDs domains were tipped. Example: www.mywebsite.com.br lost the last part of the link after ".com". Remains: www.mywebsite.com.br
It seems to happen only in links added "on the fly" by webmail. If the link is html codified in message, the correct link was shown.
If we change the display mode from HTML to TEXT the same occur with the links.
Running the lastest version Entreprise Edition 13.2 on Windows 2012.