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LarryLopez-8186 avatar image
LarryLopez-8186 asked ·

Remote Server returned '550 5.7.705 Service unavailable.

I am receiving this alert on all of my emails from my business Microsoft account. Why? How do I fix it?

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1 Answer

ShashiShailaj-MSFT avatar image
ShashiShailaj-MSFT answered ·

Hello @LarryLopez-8186 ,

Your tenant has exceeded the amount of emails that can be send due to antispam system blocking outgoing mails. This happens generally when any email address is used to send a huge number of emails from a particular tenant. Please check the following article which provides you more insights on this.

https://docs.microsoft.com/en-sg/office365/troubleshoot/antispam/tenant-has-exceeded-threshold

If you are not the Administrator for your email then you will need to contact someone who has access to the Office 365 instance for your business mail. They can check the mailflow connectors in the Exchange admin console and remove any unknown connectors which might have been used to send emails using your tenants. After this you will need to open a support ticket to get this enabled. Please have your administrator logon to the Office365/Microsoft 365 admin center and open a support case from within and a support engineer will reach out to you to help you further.


Hope this helps. If the information provided was helpful , please do accept this as answer as it will help other community members with similar queries.

Thank you.


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