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alex-pa asked poompataipuntitpong-4616 commented

Email bouncing with 550 5.7.708 Service unavailable only when using grah API for some users

Hi Everyone,

We use microsoft graph api to integrate people's mailbox with our application and also send email form our application as their outlook behalf.

The problem is some of our users cannot send the email through our application(which used microsoft API). They get a bouncing email saying "550 5.7.708 Service unavailable Access denied" Traffic not accepted from this IP. (See the attached image)

But the error only happens only when they send emails through GraphAPI, when they send email to the same person on Outlook it works flawlessly.

I noticed some people having the same problem here: and their solution is to contact microsoft. But I don't know where to get technical support when we don't have azure support subscription. I hope some microsoft staff will find this thread and advice us on how to proceed.

This is affecting our business badly. If anyone can guide us it would be much appreciated


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Hi @alex-pa are you using the developer account tenant to make the request?

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Hi @DianaWanjuhi-1579 Thanks for the reply. I'm not sure I fully understand the question. This error happen on production so the outlook account used to send the email is not developer-related in anyway. By the way is this the right place to discuss this problem in details? Is there any microsoft channel where I should take this problem to?

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