When clicking on hyperlinks that are set to open a compose email message on OSX the Mail.app application will launch. Since it is likely that your preferred email application is something other than Mail.app such as Mozilla Thunderbird, Opera, Microsoft Outlook for Mac, Postbox, Sparrow, or something else then you will want to change the default email client to your preferred email application. In my case I use MS Outlook for the Mac so I needed to set the default email client to Outlook. Use the directions below to modify the default application that opens to compose email messages.
There are various reasons why you may want to log the incoming packets for your Skype messaging client. You can log both calls and instant messages made via your Skype client using Wireshark. Wireshark is a free utility that can be used to log any traffic on your computer.