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How to Fix Gmail Bounces for Microsoft 365 Group Emails
Question details
Users are experiencing bounce-backs when sending Microsoft 365 group emails to Gmail recipients.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Sending bulk or group emails from Microsoft 365 to Gmail accounts.
- Observed behavior
- Emails that previously delivered successfully are now being rejected or bounced by Gmail due to bulk sending restrictions or missing sender authentication.
Ensure you have administrator access to the Microsoft 365 admin center and your domain's DNS hosting provider to check and update your domain authentication records.
Configure SPF, DKIM, and DMARC Authentication
Gmail requires strict sender authentication for bulk emails. Updating your DNS records ensures your emails are verified and trusted by Gmail servers.
Major email providers like Gmail have enforced stricter policies to combat spam. If your domain lacks proper Sender Policy Framework (SPF), DomainKeys Identified Mail (DKIM), or Domain-based Message Authentication, Reporting, and Conformance (DMARC) records, your messages will be rejected.
Log in to your domain registrar or DNS hosting provider. Check your existing TXT records to ensure your SPF record includes 'include:spf.protection.outlook.com'.
Navigate to the Microsoft 365 Defender portal. Go to 'Policies & rules' > 'Threat policies' > 'DKIM'. Select your domain and enable the option to sign messages with DKIM signatures.
Add a DMARC TXT record in your DNS settings (e.g., _dmarc.yourdomain.com) to instruct Gmail on how to handle messages that fail SPF or DKIM authentication.
Manage Sending Limits and Bulk Email Practices
Avoid triggering Gmail's spam filters by adhering to Microsoft 365 sending limits and utilizing proper bulk email practices.
Looking for a Lightweight and Free Office Suite?
While troubleshooting your Microsoft 365 email exchange issues, you might be looking for a more cost-effective way to handle your daily document tasks. WPS Office offers a free, lightweight, and highly compatible alternative for creating, editing, and sharing documents.
- 1. Download the Installer: Visit the official WPS website and click the download button for your specific operating system.
- 2. Install WPS Office: Run the downloaded setup file and follow the on-screen instructions to complete the lightweight installation.
- 3. Open Your Office Files: Launch WPS Office and directly open your existing Word, Excel, or PowerPoint files without losing any formatting.
Frequently Asked Questions
Why are my emails to Gmail suddenly bouncing when they worked fine before?
Gmail frequently updates its security policies to protect users from spam. Recently, they have enforced stricter requirements for bulk senders, meaning you now must have proper SPF, DKIM, and DMARC authentication configured to prevent your emails from bouncing.
How do I find out exactly why my email bounced?
Open the Non-Delivery Report (NDR) or the bounce message email you received. It contains an error code (such as 5.7.1) and a specific diagnostic reason directly from Gmail's servers explaining exactly why the rejection occurred.
Can I use Microsoft 365 to send mass marketing emails to my customers?
Microsoft 365 is not designed for bulk marketing campaigns; its bulk delivery is provided merely on a best-effort basis. If you regularly send high-volume marketing emails, it is highly recommended to use an approved third-party bulk email service provider.
