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.
I am a huge fan of Gmail which I use to consolidate multiple email addresses in one location so I can easily search, store, and manage tens of thousands of emails dating years back. One of the issues I run into is archiving email messages or managing more than the default screen of 25 email conversations at a time. There are two tricks that can assist you managing more than 25 messages at a time using the Gmail web interface which I explain in more detail below. It is also possible to use an email client such as Microsoft Outlook to drag and drop email messages between folders or labels as they are known within Gmail.