How to make application trusted to outlook

I have created one application which is reading outlook mail, but when user install that application in their system and run it; they are getting pop up from outlook saying that "Som开发者_高级运维e external application want to access your outlook, do you want to grant access to it?.... ". How can I make my application trusted to outlook?

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One way would be to create the application as an add-in in Outlook. Add-ins are trusted.

Another way would be to use a 3th party component like "outlook redemption"