I’m developing an application with PHP that sends emails to customers. The body of the email contains a URL hyperlink back to our site kind of like this:
http://myserver/myfolder/test.cfm?id=una-bottiglia-di-vino-©-®
The above url contatins copyright and registered symbols
In Yahoo, GMail, Outlook, etc. the link displayed as I sent. However Hotmail displays the href url as encoded
http://myserver/myfolder/test.cfm?id=una-bottiglia-di-vino-%a9-%ae
In your mail you just do urlencode($myUrl);
More information: http://php.net/manual/en/function.urlencode.php