Teams meeting invites quarantined

Matthew Shaw 0 Reputation points

Hi, we are having problems with email (Teams) invites being blocked/quarantined by external companies. I have checked our SPF, DKIM etc extensively and can't identify any obvious cause. We use O365 and exchange, can you suggest any resolutions or further testing I can try as this is now causing extensive issues to our business.

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  1. JimmyYang-MSFT 48,541 Reputation points Microsoft Vendor

    Hi @Matthew Shaw

    Are there any NDR error messages when email invites blocked?

    What is your environment now? Exchange Online or hybrid environment?

    If you send normal emails to external organization, can they receive it normally?

    It sounds like you have already done some troubleshooting to identify the cause of the issue. One thing you could try is checking if your domain is on any email blacklists. You can use a tool like MX Toolbox to check this.

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