This problem seems to result from the latest HTC update to the Webview component. Uninstall that and mail works again. See the "Web viewer and Mail App Crashes" thread in the HTC One M8 forum (new here so I can't post links).
This problem seems to result from the latest HTC update to the Webview component. Uninstall that and mail works again. See the "Web viewer and Mail App Crashes" thread in the HTC One M8 forum (new here so I can't post links).