>>>> In Windows Explorer click Tools | Folder Options | File Types. Scroll
>>>> down a bit and find URL: MailTo Protocol among those with no extension.
>>>> Select it and click Advanced. Select 'open' and click Edit. Make sure
>>>> Application points to Outlook.

>
> When I do the above setup for MailTo, when I click on a reply to email
> address or try to send a link, Outlook opens continuously where over 50
> instances initiate and it is rough to stop them continuously opening. I
> selected the Run option with the Outlook program to be set up under the
> Advanced selection.