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In the Authorization tab for a request, select NTLM Authentication from the Type dropdown list. Enter your Username and Password for NTLM access (use variables to avoid entering the values directly). You can optionally specify advanced parameters, but Postman will attempt to autocomplete these if necessary.
The current app version of Postman (both the Chrome app and native app versions) does not support NTLM authentication.
I got this working by running Fiddler first.
you can use the the NTLM authorization exist in the Authorization tab same as this photo
I don't think there is a way to do that. But, you are not alone in wanting it...
https://github.com/postmanlabs/postman-app-support/issues/1137
[EDIT] As of the addition of this edit, Postman has NTLM Authentication in beta in their most recent release.
https://www.getpostman.com/docs/v6/postman/sending_api_requests/authorization
I suggest using insomnia. It's free and you can see the documentation on how to add NTLM Auth here: https://insomnia.rest/documentation/authentication/
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