Sending Emails using the Email Field Type

I am having untold problems sending an email using the standard Ninox email field type.

Apart from a bunch of other issues I cannot for the life of me figure out why some email addresses allow me to send the email (that is it opens the email in my Outlook Cleint) and others it simply will not open Outlook at at all.  An attempt is made as I can see something flicker when I click the icon but nothing happens.  If I change my email address to an alternative of mine Outlook opens.

I have emailed support but if anyone has a suggestion I would be grateful