Spam Filter Blocks - Improve Content and Sender Reputation

Modified on: Fri, 13 Feb, 2026 at 9:36 AM

Resolving Spam-Like Content and Unsolicited Email Blocks

What's Happening?

Your emails are being blocked or rejected because recipient email servers, ISPs, or spam filters have identified your messages as spam-like, unsolicited, or violating content policies. This can happen even with legitimate marketing emails when certain triggers are detected in your content, sending patterns, or sender reputation.

Quick Diagnosis: Identifying Spam-Like Content Issues

Bounce Message Examples

  • "The message was blocked because it was detected as spam or contained spam-like content"
  • "The message was rejected because it was flagged as spam or failed content filtering policies"
  • "The message was blocked because it was detected as spam or unsolicited by Comcast"
  • "The message was rejected because it was flagged as spam or unsolicited by the recipient's server"
  • "The message was rejected as spam or for violating recipient security or content policies"
  • "Message rejected due to spam detection or blacklisted URLs, often by content filters or anti-abuse policies"
  • "Recipient previously marked your emails as spam, so future messages are not delivered"
  • "The message was rejected because it was detected as spam by the recipient's content filters"
  • "Gmail blocked your IP for sending a high volume of unsolicited or spam-like emails"

Understanding Spam-Like Content Detection

Key Concepts

Important Information:

  • Spam filters analyze content, sender behavior, and recipient engagement patterns
  • Even legitimate emails can trigger spam filters if they contain certain keywords or formatting
  • Previous recipient complaints significantly impact future deliverability
  • High-volume sending without proper warm-up increases spam detection risk
  • Content quality and relevance are crucial for avoiding spam classification

Common Spam Triggers

Content-Based Triggers:

  • Excessive use of promotional language ("FREE", "URGENT", "ACT NOW")
  • Poor grammar, excessive punctuation, or ALL CAPS text
  • Suspicious links or shortened URLs
  • Image-heavy emails with little text content

Behavioral Triggers:

  • High sending volume without proper IP/domain warm-up
  • Low engagement rates (opens, clicks) from recipients
  • High complaint rates or spam reports
  • Sending to purchased or unverified email lists

Step-by-Step Spam Content Resolution

Step 1: Audit Your Email Content

Instructions:

  1. Review your email templates:
    • Go to MarketingEmailsTemplates
    • Examine subject lines and body content for spam trigger words
    • Remove excessive promotional language and replace with value-focused messaging
    • Ensure proper text-to-image ratio (aim for 60% text, 40% images)
  2. Test your content:
    • Use external tools like Mail Tester (mail-tester.com) to score your emails
    • Send test emails to different email providers (Gmail, Outlook, Yahoo)
    • Check if emails land in inbox, promotions, or spam folders

Step 2: Review Your Email Lists and Segmentation

Instructions:

  1. Clean your contact lists:
    • Go to ContactsSmart Lists
    • Create segments for engaged vs. unengaged contacts
    • Remove contacts who haven't engaged in 90+ days
    • Verify all contacts have proper opt-in records
  2. Implement re-engagement campaigns:
    • Create targeted campaigns for low-engagement contacts
    • Offer clear unsubscribe options in every email
    • Remove non-responsive contacts after re-engagement attempts

Step 3: Optimize Sending Patterns

Instructions:

  1. Implement gradual volume increases:
    • Go to MarketingEmails → Campaigns
    • Start with small batches (100-500 emails) to your most engaged contacts
    • Gradually increase volume based on engagement rates
    • Monitor delivery rates and adjust sending frequency accordingly
  2. Schedule strategic send times:
    • Use CampaignsSchedule to optimize timing
    • Avoid sending large volumes during peak spam detection hours
    • Spread sends throughout the day rather than bulk sending

Content Optimization Success Indicators

  • Spam testing tools show scores above 8/10
  • Test emails consistently land in primary inbox folders
  • Engagement rates (opens/clicks) improve within 2-3 campaigns
  • Bounce rates decrease and complaint rates stay below 0.1%
  • No spam-related bounce messages in campaign reports

Step 4: Monitor External Reputation Signals

Instructions:

  1. Check your sender reputation:
    • Visit Sender Score (senderscore.org) to check your IP reputation
    • Use MXToolbox (mxtoolbox.com) to verify your domain isn't blacklisted
    • Monitor Talos Intelligence (talosintelligence.com) for reputation status
  2. Set up ongoing monitoring:
    • Create weekly checks of reputation services
    • Monitor Google Postmaster Tools for Gmail-specific insights
    • Track delivery rates within GoHighLevel's campaign reports

Recovery Timeline and Expectations

Phase 1: Immediate Actions (Days 1-7)

  • Action: Content audit and optimization, list cleaning
  • Expected outcome: Reduced spam trigger words, cleaner contact lists
  • Deliverability impact: May see slight improvement in new campaigns

Phase 2: Reputation Building (Weeks 2-4)

  • Action: Gradual volume increases, engagement-focused campaigns
  • Expected outcome: Improved engagement rates, fewer spam complaints
  • Deliverability impact: Noticeable improvement in inbox placement

Phase 3: Full Recovery (Months 2-3)

  • Action: Consistent high-quality sending, ongoing list hygiene
  • Expected outcome: Stable high deliverability rates
  • Deliverability impact: Return to optimal inbox placement rates

Prevention Best Practices

Content Guidelines

  • Subject Lines: Keep under 50 characters, avoid excessive punctuation
  • Body Content: Focus on value, use conversational tone
  • Call-to-Actions: Use clear, specific language instead of generic "Click Here"
  • Personalization: Use recipient names and relevant content

List Management

  • Double Opt-in: Implement confirmation emails for new subscribers
  • Regular Cleaning: Remove inactive contacts quarterly
  • Segmentation: Send targeted content based on engagement levels
  • Unsubscribe Process: Make it easy and honor requests immediately

Still Having Issues?

If you continue to experience spam-related delivery challenges:

  1. Document patterns: Track which types of content or recipients trigger spam filters
  2. A/B test extensively: Test different subject lines, content styles, and send times
  3. Consider dedicated IP: For high-volume senders, a dedicated IP may provide better control
  4. Review authentication: Ensure SPF, DKIM, and DMARC records are properly configured

Need Expert Spam Prevention Help?

Spam issues can be complex, involving multiple technical and content factors that require specialized expertise to resolve effectively.

Get professional assistance with:

  • Advanced content optimization and spam testing
  • Sender reputation recovery and monitoring setup
  • List segmentation and re-engagement strategies
  • Technical authentication and deliverability configuration
  • Long-term deliverability strategy development

Don't let spam filters derail your email marketing success - get expert guidance today!

Was this article helpful?

That’s Great!

Thank you for your feedback

Sorry! We couldn't be helpful

Thank you for your feedback

Let us know how can we improve this article!

Select at least one of the reasons
CAPTCHA verification is required.

Feedback sent

We appreciate your effort and will try to fix the article