Original post by Rich Graves

Sending mailto: links to Zimbra in Windows

The preferred way to set Zimbra as the default email program in Windows involves a Registry hack, which you can download here. It does, however require administrative privileges. Zimbra will open in whatever is set as your default browser.

Step by Step: mailto: handled by Zimbra

  1. Open regedit.exe
  2. Navigate to HKEY_CLASSES_ROOT\mailto\shell\open\command
  3. To open the (faster) "Standard HTML" compose window in your default browser (whether it's IE, Firefox, Safari, Chrome, or Opera), set the (Default) value to

    explorer ""

    Registry download (Standard)

  1. To open in the "Advanced AJAX" compose window,set HKCR\mailto\shell\open\command to

    explorer ""

    Registry download (Advanced)

  1. To force it to a particular non-default browser, replace "explorer" (which is equivalent to typing something into Start -> Run) with the full path to the browser program. In the case of IE, that would be

    "c:\program files\internet explorer\iexplore.exe" 

Note that the right-click "Send To..." feature will continue to want to open a full MAPI program like Outlook, but you can open a mailto: link and then add the attachment.

Quick Fix

Many systems will not allow download and open of .reg files, but if RegEdit scares you, try this:

  1. Download this file
  2. Choose to Open the file
  3. Click OK to accept Internet content, and again to merge into the Registry)


 The file attachment "Send To..." functionality of Explorer and other applications is not supported. You would need an applications such as Zimbra Notifier

Sending mailto: links to Zimbra on a Mac

The older posted information has been hidden, as the solution is no longer being developed. 'Edit' the page to see the hidden text.

2/28/13-MD: I was recently directed to a possible solution for Chrome and Safari (but not for Firefox) to handle redirects for 'mailto' links. I have tested it with the current version of Chrome and I am happy to say it works, BUT I cannot say if it will last forever (as many 3rd party developed items die horrible deaths).


Skip to end of metadata
Go to start of metadata

  • No labels