Issue
Is there a way to prevent opening a new browser window when a mailto/email address link in an email is clicked?
Solution
The reason why the link clicked in an email redirects to a new browser window occurs is because the link is a tracked link. As per design of Marketo tracked links, they are required to be loaded in a browser first which is why the mailtolink/email address clicked is loading in the browser first.
If you wish to load the link clicked in the same window and not redirect to a new browser window, you will need to disable tracking on the link.
https://docs.marketo.com/display/public/DOCS/Disable+Tracking+for+an+Email+Link
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