question

MarcoFillion-5077 avatar image
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MarcoFillion-5077 asked ·

Send email via Graph and Exchange Online not delivery message : Access denied, traffic not accepted from this IP (5.7.708)

Hi, Everything working fine to send email via Graph by ASP.NET Core 5.0 Application. Big problem, Exchange Online won't delivery the message like title said. I read documentation and follow instructions to get it working, but it is not working. Someone already have problem like that ? Thank you !

office-exchange-online-itpromicrosoft-graph-mail
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AndyDavid avatar image
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AndyDavid answered ·

This isnt a Graph Issue. You are being blocked because Exchange Online doesnt allow email from IPs it considers untrustworthy
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-5-7-700-through-5-7-750

5.7.708 Access denied, traffic not accepted from this IP: This error occurs when sending email from known, low reputation IP addresses that are typically used by new customers.


5.7.708 Access denied, traffic not accepted from this IP
This error can happen when you are trying out a Microsoft 365 trial tenant. If you receive this error before you can purchase licenses, contact support to request an exception for the low reputation IP address until you're able to purchase licenses.

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MarcoFillion-5077 avatar image
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MarcoFillion-5077 answered ·

Hello AndyDavid,

Thank you for your answer. Very appreciated.

I bought this morning the Exchange Online Basic Plan 1.

How long to be considered safe ?

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Might take a day or so. If it still doesnt work in a few days, I open contact 365 support.

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joyceshen-MSFT avatar image
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joyceshen-MSFT answered ·

Hi @MarcoFillion-5077

Is there any update about your issue? If you still have issue sending emails from your o365 tenant, you may try contacting the o365 support team with below methods

Ways to contact support for business products - Admin Help


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