How to fix 'Remote server returned '550 5.7.708 Service unavailable' while sending emails through postman.

ShivaKarthik Rao 20 Reputation points

I am able to send mail through Graph API but it is not received by the recipient. I have added O365 licenses and given all the permissions to the application which was created in the Azure portal. An access token is generated differently for the domain and Please help!

A family of Microsoft email and calendar products.
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A Microsoft API that enables you to manage these resources and actions related to applications in Azure Active Directory.
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  1. ChristyZhang-MSFT 15,351 Reputation points Microsoft Vendor

    Hi @ShivaKarthik Rao ,

    Welcome to our forum!

    Would you please provide more information about the error 'Remote server returned '550 5.7.708 Service unavailable'? Such as a screenshot. (In order to avoid privacy, please remember to hide your personal information.)

    Based on my research on the error "50 5.7.708", this error can happen when you are trying out a Microsoft 365 trial tenant. More information: 5.7.708 Access denied, traffic not accepted from this IP.

    User's image

    In addition, i found a similar thread as yours, it's suggested that you could try the suggestion as Oliver Wu MSFT mentioned:

    User's image

    Hope to help you!

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