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How do I troubleshoot spam placement in Google Workspace?

Matthew Whittaker profile picture
Matthew Whittaker
Co-founder & CTO, Suped
Published 22 Apr 2025
Updated 19 Aug 2025
7 min read
Emails landing in spam is a frustrating issue, especially when you are sending through a trusted platform like Google Workspace. Many assume that because it is Google, deliverability is automatic and guaranteed, but that is not always the case. Even with Google's robust infrastructure, emails can still end up in the spam folder, impacting communication and business operations.
Troubleshooting spam placement in Google Workspace requires a methodical approach, much like with any other sending platform. While some specific tools or data points might differ, the core principles of email deliverability remain the same. The goal is to identify why gmail.com logoGmail (and other email providers) are flagging your messages as junk and implement the necessary fixes.
I'll guide you through the key areas to investigate and the steps you can take to improve your inbox placement rates when sending via Google Workspace. This involves looking into authentication, sender reputation, content, and recipient engagement.

Verify your email authentication

One of the most common reasons emails end up in spam, regardless of the sending platform, is improper or missing email authentication. For Google Workspace, this means ensuring your SPF, DKIM, and DMARC records are correctly set up and aligned. These protocols verify that your emails are legitimately coming from your domain, which is critical for trust with mailbox providers.
If you are encountering a 550 5.7.26 unauthenticated sender error in Google Workspace, it often points to DKIM issues. You can verify your DNS records by using a free online email testing tool to check their validity. Make sure the DNS records, including MX, DKIM, and SPF, are properly configured.
Google has also introduced new requirements for bulk senders, emphasizing strong authentication, easy unsubscribe options, and maintaining a low spam rate. Even if you are not a bulk sender in the traditional sense, these guidelines affect all senders and play a crucial role in Google's filtering decisions. If your emails are landing in spam despite passing authentication, there could be other factors at play, which we will explore further.

Essential authentication records

To ensure your emails are not sent to spam due to authentication issues, here are the critical records to verify and configure for your domain.
  1. SPF (Sender Policy Framework): Authorizes sending servers for your domain. Ensure your SPF record includes _spf.google.com.
  2. DKIM (DomainKeys Identified Mail): Provides a digital signature to verify email integrity and sender identity. Configure this in your Google Workspace Admin console. It is critical to diagnose and reduce DKIM errors.
  3. DMARC (Domain-based Message Authentication, Reporting & Conformance): Builds upon SPF and DKIM, telling receiving servers how to handle emails that fail authentication. Start with a p=none policy to collect reports before enforcing stricter policies. You can use a free DMARC record generator tool to create one.

Monitor your sender reputation

Sender reputation is perhaps the most critical factor in email deliverability. Gmail maintains a reputation score for every sending IP and domain. If your domain or the shared IP addresses used by Google Workspace (which you have less control over) acquire a poor reputation, your emails are likely to land in the spam or junk folder. This happens when recipients mark your emails as spam, or if your bounce rates are high. For Google Workspace users, this can be particularly challenging because Google Postmaster Tools (GPT) provides limited data for Google Workspace users.
The lack of specific spam complaint data for Workspace can make diagnosing issues tricky. However, you can still monitor your overall domain reputation through Google Postmaster Tools and look for trends in your delivery status. A significant drop in successful deliveries or an increase in undelivered messages can indicate a reputation problem. You will also want to monitor if your domain or IP has been placed on any email blocklist (or blacklist).
Maintaining a low spam rate is crucial, with Google recommending keeping it below 0.1%. Anything above 0.3% is considered poor and will likely lead to deliverability issues. Even if you can't see specific user-reported spam counts in GPT for Workspace, you can infer issues from overall deliverability and, crucially, user feedback.

Metric

General Email Sending

Google Workspace Sending

Reputation Data
Detailed insights from Google Postmaster Tools available for dedicated IPs/domains.
google.com logoLimited reputation data provided by Google Postmaster Tools for Workspace, making diagnostics harder.
IP Reputation
Direct control over dedicated IP reputation management.
Uses shared IP pools, so IP reputation can be influenced by other users. Less direct control over IP blocklist (blacklist) status.
Spam Complaints
Direct feedback loops (FBLs) from ISPs on user-reported spam.
Limited direct spam complaint reporting for Google Workspace via GPT.
To keep tabs on your reputation, you should regularly check major blocklists (or blacklists) to see if your domain or any associated IPs are listed. While Google Workspace manages the sending infrastructure, a poor reputation from your domain can still lead to deliverability problems.

Optimize content and manage recipient engagement

The content of your email and how recipients engage with it significantly influence spam placement. Even with perfect authentication and a stellar sender reputation, poorly crafted emails or those sent to disengaged lists can trigger spam filters. This includes using spammy keywords, suspicious links, or deceptive subject lines.
Google's filters are sophisticated, analyzing various aspects of your email. High complaint rates (even if you cannot see granular data for Workspace accounts in GPT), low open rates, and frequent unsubscribes signal to Gmail that your emails are not desired, increasing the likelihood of future messages landing in the spam folder. Conversely, positive engagement (opens, clicks, replies) boosts your sender reputation.

Content and list hygiene best practices

  1. Content review: Avoid excessive capitalization, exclamation points, and spam trigger words. Ensure your email content is balanced and provides value to the recipient.
  2. Personalization: Personalize emails where appropriate to increase engagement and relevance.
  3. List quality: Regularly clean your email list to remove inactive or invalid addresses. Avoid purchased lists, as they often contain spam traps and unengaged users, which can damage your reputation and lead to you being placed on a blacklist.
  4. Segmentation: Segment your audience to send targeted content that resonates with specific groups, thereby improving engagement.
If you are struggling with sudden Gmail spam delivery, consider if there have been any recent changes to your email content, sending volume, or list management practices. Even minor adjustments can have an impact. Always make it easy for recipients to unsubscribe with a clear and prominent unsubscribe link.

Advanced troubleshooting and continuous monitoring

Even after addressing authentication, reputation, and content, ongoing monitoring and advanced troubleshooting are essential for sustained inbox placement. Regularly review your DMARC reports for insights into authentication failures and potential spoofing attempts. While Google Postmaster Tools offers limited data for Google Workspace, it is still a valuable resource for overall domain health metrics like IP reputation and domain reputation. You can also determine your Gmail spam folder placement rate using other tools.
Analyze your email deliverability reports, paying close attention to bounce rates and types. High soft bounce rates might indicate temporary server issues or recipient inbox problems, while hard bounces point to invalid addresses that should be removed immediately from your list. Also, monitor your sender score (often a component of your sender reputation) and look for any unusual dips that could indicate an issue.
Consider implementing an inbox placement test using an external tool to see where your emails actually land across various email providers, including Google. This can provide a clearer picture of deliverability issues beyond what Google Postmaster Tools offers for Workspace accounts. Regularly test your email templates with spam filter tools to identify potential content triggers before sending.
Finally, be proactive about user feedback. If recipients report emails landing in spam, investigate immediately. This user behavior directly impacts your reputation with Google. Addressing issues swiftly and continuously refining your email strategy based on data will help you maintain optimal deliverability from Google Workspace.

Views from the trenches

Best practices
Actively manage your sender reputation by consistently monitoring engagement rates and user feedback within Google Workspace.
Regularly clean and segment your email lists to ensure you are only sending to engaged and valid recipients, reducing bounces and spam complaints.
Prioritize easy unsubscribe options and honor requests promptly to maintain a positive sender-recipient relationship and avoid being flagged as spam.
Common pitfalls
Neglecting to properly configure SPF, DKIM, and DMARC records, leading to authentication failures and direct routing to spam folders.
Relying solely on Google Postmaster Tools for comprehensive deliverability insights, as it offers limited data for Google Workspace accounts.
Sending emails to unengaged or outdated lists, which drastically increases bounce rates and user-reported spam, damaging domain reputation.
Expert tips
Use external inbox placement testing tools to get a holistic view of where your emails are landing across various mailbox providers, supplementing Google Postmaster Tools data.
Implement a DMARC policy, even a `p=none` initially, to gain visibility into your email authentication failures and identify potential spoofing.
For large-volume senders, consider gradual email warming if you significantly increase sending volume from Google Workspace to build trust with receivers.
Marketer view
Marketer from Email Geeks says: General deliverability factors such as IP and domain reputation, maintaining list quality, and monitoring complaint rates are essential for good inbox placement.
2024-03-11 - Email Geeks
Marketer view
Marketer from Email Geeks says: A significant challenge in troubleshooting Google Workspace spam placement is the lack of detailed reputation and complaint data in Google Postmaster Tools for these accounts.
2024-03-11 - Email Geeks

Key takeaways for Google Workspace email deliverability

Troubleshooting spam placement in Google Workspace emails might seem daunting given the limited direct feedback from Google Postmaster Tools for these accounts. However, by focusing on the fundamental pillars of email deliverability, you can significantly improve your chances of reaching the inbox.
Ensure your authentication is rock-solid, actively manage your sender reputation through engagement and list hygiene, and continually monitor all available metrics, including bounce rates and user feedback. By taking a proactive and diligent approach, you can navigate the complexities of email filtering and maintain strong email deliverability within the Google Workspace ecosystem.

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