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Fix Gmail Rejecting Emails Due to Low Domain Reputation
Question details
Users need to resolve an issue where Gmail rejects their outgoing emails, citing a low sending domain or IP reputation.
- Product
- Email / Exchange Online
- Device & OS
- not provided
- Scenario
- Sending emails, especially in bulk, to Gmail recipient addresses.
- Observed behavior
- Messages are bounced back and rejected by Gmail with the error code 550 5.7.350, indicating poor domain or IP reputation.
Make sure you have administrative access to your domain's DNS records and can log in to your email provider's management console.
Verify Domain Authentication and Blocklists
Check your SPF, DKIM, and DMARC settings to ensure they are correctly configured and verify your domain is not on a blocklist.
Correct domain authentication is essential for email delivery, though it does not guarantee placement if your reputation is already poor.
Log in to your DNS hosting provider and verify that your SPF and DKIM TXT records are correctly published and valid for your email server.
Ensure you have a DMARC record in place that aligns with your SPF and DKIM configurations to provide clear instructions to receiving servers.
Use online blocklist lookup tools to see if your sending IP address or domain has been flagged for spam. If listed, follow the specific removal instructions provided by the blocklist operator.
Adjust Sending Practices for Bulk Email
Modify how you send campaigns and consider using a dedicated bulk email service.
Register with Google Postmaster Tools
Use Google Postmaster Tools to monitor your domain's reputation directly with Gmail.
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Frequently Asked Questions
Why is Gmail rejecting my emails with error 550 5.7.350?
Error 550 5.7.350 indicates that Gmail's spam filters have rejected your message because the sending domain or IP address has a low reputation or has been flagged for suspicious sending patterns.
Does setting up SPF and DKIM guarantee my emails will be delivered?
No. While SPF, DKIM, and DMARC are crucial for proving your identity and preventing spoofing, they do not guarantee inbox placement if your domain has a history of high spam rates, poor content, or sudden spikes in sending volume.
Can I use Microsoft Exchange Online to send bulk email campaigns?
Exchange Online is not designed for bulk emailing and provides only best-effort delivery for such usage. For marketing campaigns or large-scale broadcasts, it is highly recommended to use a dedicated third-party bulk email service provider.
How long does it take to fix a poor domain reputation?
Rebuilding a domain's reputation takes time and consistency. By correcting authentication records, eliminating spammy practices, lowering volume, and ensuring recipients engage positively, your reputation typically improves gradually over several weeks.
