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Fix Microsoft 365 Emails Not Delivered to Multiple Gmail Recipients
Question details
Users are unable to successfully send emails from a Microsoft 365 account to multiple Gmail recipients simultaneously, resulting in delivery failures.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Sending bulk or group emails from a Microsoft 365 Exchange account to multiple Gmail addresses.
- Observed behavior
- Emails fail to deliver to multiple Gmail recipients and return an error, whereas messages to individual Gmail addresses or other email domains are successfully delivered.
Before troubleshooting, ensure you have global administrator access to the Microsoft 365 admin center and have your domain's DNS hosting credentials ready to verify authentication records.
Verify and Configure SPF, DKIM, and DMARC Records
Gmail enforces strict sender authentication policies for bulk emails. Correctly configuring your domain's DNS records will verify your sender identity and prevent rejection.
Google requires senders who email multiple Gmail addresses to have properly configured SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting, and Conformance) records. Missing or incorrect records will cause bulk emails to be rejected or marked as spam.
Log in to your DNS hosting provider's portal. Ensure your domain has an active TXT record for SPF that includes Microsoft 365: 'v=spf1 include:spf.protection.outlook.com -all'.
Open the Microsoft 365 Defender portal, navigate to 'Email & Collaboration' > 'Policies & Rules' > 'Threat policies' > 'DKIM', and enable signing for your domain.
In your DNS settings, add a new TXT record for '_dmarc.yourdomain.com' with the value 'v=DMARC1; p=none;' (or quarantine/reject if you have stricter policies) to align with Google's bulk sender guidelines.
Run a Message Trace and Review the Non-Delivery Report (NDR)
Use the Extended Message Trace feature in Microsoft 365 to pinpoint exactly why Gmail servers rejected the emails.
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Frequently Asked Questions
Why does Gmail block emails sent to multiple recipients but not single recipients?
Google employs stringent spam and bulk-sender policies to protect users. If an email is sent to multiple Gmail addresses simultaneously without proper domain authentication (such as SPF, DKIM, and DMARC), Google's automated filters are highly likely to flag and reject the message as potential spam.
What is a Non-Delivery Report (NDR)?
An NDR is an automated bounce-back message generated by an email server to inform the sender that their email could not be delivered. It contains valuable diagnostic codes and explanations that pinpoint the exact cause of the failure.
Is there a limit on how many recipients I can email at once in Microsoft 365?
Yes, Microsoft 365 imposes strict recipient rate limits to prevent spam. Typically, users are limited to 500 recipients per message and up to 10,000 recipients per day. Exceeding these limits will result in delivery failures.
How do I check if my domain's SPF record is correct?
You can use free online tools like MXToolbox to perform an SPF record lookup. For Microsoft 365, a correct SPF record usually looks like this: v=spf1 include:spf.protection.outlook.com -all.
