LC Email: Email Service Provider Block Detected - Immediate Action Required to Restore Email Sending

Email Deliverability New ESP Block Policy Understand how ESP block rates, warnings, and temporary suspensions work — and what you need to do before the policy takes effect. Implementation Timeline Effective Date: 12th Feb 2026. This new ESP Block Policy will be implemented on 12th Feb 2026. Current users will receive advance notification and have time to review their email practices before enforcement begins. What you should do now: review your current bounce classification data, implement recommended email authentication and best practices, clean your email lists and improve content quality, and monitor your ESP block rates closely. 1 ## What Are ESP Blocks? ESP blocks occur when major email providers (Gmail, Yahoo, Outlook, etc.) reject your emails due to: - Authentication failures (DMARC, SPF, DKIM issues)

Poor sender reputation
Content that appears spam-like
Policy violations
Technical configuration problems Why This Matters Unlike regular bounces, ESP blocks are calculated separately and trigger immediate restrictions to protect your long-term email deliverability. 2 ## ESP Block System The block system escalates through three temporary blocks, with warning emails sent before each one. Here is the full progression: | ESP Block Rate | Action | Duration | Block Level | | --- | --- | --- | --- | | 3% | Warning Email Sent | Immediate notification | Pre-Block Warning | | 5% | Email sending suspended | 12 hours | 1st Block | | 3% (after 1st block) | Critical Warning Email Sent | Immediate notification | Pre-2nd Block Warning | | 5% (after 1st block) | Email sending suspended | 24 hours | 2nd Block | | 3% (after 2nd block) | Final Warning Email Sent | Immediate notification | Pre-3rd Block Final Warning | | 5% (after 2nd block) | PERMANENT SUSPENSION | Permanent | 3rd Block — FINAL | Critical All blocks are reset after 7 consecutive days of maintaining ESP block rates below 1%. Good to Know In this release, email sending will not be permanently disabled. Each block will be temporary and limited to a 24-hour duration only. 3 ## What You’ll See When Blocked If your email service is blocked due to ESP Block Detected, you will see the following error message displayed as a top banner inside the affected subaccount: Email sending is blocked due to a high number of spam blocks from email providers. This block is enforced to protect email deliverability and prevent further reputation damage with Email Service Providers (ESPs). 4 ## How to Request Permanent Unblock Permanent unblocking cannot be done automatically. Reach out to your agency owner in order to unblock the same. Note Agency owners review each request manually before lifting a permanent suspension to ensure the underlying deliverability issues have been addressed. 5 ## Why This Matters Protecting Your Business - ESP blocks damage your sender reputation permanently
Poor reputation leads to emails landing in spam folders
Reduced deliverability impacts your business revenue
Recovery can take weeks or months without proper action Industry Standards - Major ESPs are increasingly strict about email quality
Authentication requirements are now mandatory
Content filtering has become more sophisticated
Sender reputation affects all future campaigns 6 ## Next Steps Step 1 — Analyze Use the Bounce Classification to understand your specific ESP blocks. Step 2 — Fix Address the identified issues using our detailed support guides. Step 3 — Monitor Track your improvements through the analytics dashboard. Step 4 — Verify Ensure fixes are working before resuming normal sending. 7 ## Support Resources Bounce Classification - Access detailed ESP block analysis
View error categories and volumes
Get specific recommendations for your account
Monitor improvement progress Category-Specific Support Guides. Each ESP block category in your analytics dashboard links to detailed fix guides: DMARC Authentication Failures Domain / IP Reputation Issues Content and Spam Filtering Technical Configuration Problems And more… 8 ## Time-Sensitive Actions Before Policy Implementation - Complete email authentication setup
Clean all email lists thoroughly
Optimize email content and templates
Test email delivery across major providers
Monitor analytics dashboard daily Within 24 Hours of Warning - Review analytics data immediately
Identify top 3 ESP block categories
Begin implementing critical fixes (authentication, major content issues) Within 48 Hours of Block - Complete all technical fixes
Clean email lists and remove problematic content
Test email delivery to major providers Ongoing - Monitor analytics dashboard daily
Maintain email best practices
Regular list hygiene and engagement monitoring 9 ## Important Reminders - ESP blocks are separate from regular bounces — they require immediate attention.
Each provider has different requirements — use analytics to see provider-specific issues.
Prevention is better than cure — implement proper email practices from the start.
Time is critical — delays in fixing issues can lead to permanent restrictions.
You have 30 days to prepare — use this time wisely to optimize your email practices. Take Action Now Your email deliverability and business success depend on taking action now. Start with the Email Analytics dashboard and begin preparing for the new policy implementation. 10 ## Frequently Asked Questions Q: When does this new policy take effect? The ESP Block System will be implemented on 12th Feb 2026, giving all users 30 days to prepare and optimize their email practices. Q: What happens to my current ESP blocks? Your ESP block history will reset on the implementation date. However, we strongly recommend addressing any current issues before the policy goes live to ensure smooth operations. Blocks reset after 7 consecutive days of maintaining ESP block rates below 1%. However, if you receive 3 blocks within any 7-day period, permanent suspension will occur. Q: Can permanent suspensions be reversed? Permanent unblocking cannot be done automatically. Reach out to your agency owner in order to unblock the same. Q: Will I receive notifications before each block? Yes — you will receive warning emails when your ESP block rate reaches 3%, giving you time to take corrective action before the 5% threshold triggers a block. Q: What if I’m currently above 3% ESP block rate? Use the preparation period before 12th Feb 2026 to address these issues. The block system will not be enforced until the implementation date, giving you time to fix problems. Q: How is this different from regular bounce management? ESP blocks are calculated separately from regular bounces and have their own block system. Regular bounces (invalid addresses, full mailboxes) are handled differently than ESP blocks (reputation, authentication, policy issues). We’re Here to Help This policy is designed to protect your sender reputation and ensure long-term email deliverability success. We’re here to help you prepare and succeed with these new requirements. Was this article helpful? That’s Great! Thank you for your feedback Sorry! We couldn’t be helpful Thank you for your feedback Feedback sent We appreciate your effort and will try to fix the article