ESP Block Monitoring and Progressive Email Enforcement

Modified on: Thu, 21 May, 2026 at 12:50 PM

HighLevel monitors ESP blocks to help protect sender reputation and email deliverability. When mailbox providers reject too many emails from a sub-account, HighLevel may send a warning email or temporarily pause email sending. This article explains how ESP block enforcement works, what each warning means, and what to do if your email sending is paused.

TABLE OF CONTENTS

What is ESP Block Monitoring and Progressive Email Enforcement?
Key Benefits of ESP Block Monitoring
How ESP Block Enforcement Works
Warning Email: Risk of Suspension
12-Hour Temporary Suspension
In-App Suspension Banner
24-Hour Temporary Suspension
Future Enforcement: Permanent Suspension
How To Prevent ESP Block Enforcement
What To Do If Your Email Sending Is Paused
Frequently Asked Questions
Related Articles

What is ESP Block Monitoring and Progressive Email Enforcement?

ESP blocks happen when mailbox providers such as Gmail, Outlook, or Yahoo reject emails due to sender reputation, authentication, engagement, content, or sending behavior. Monitoring these blocks helps protect your sub-account and the broader HighLevel email infrastructure.

HighLevel’s ESP Block Monitoring and Progressive Email Enforcement system automatically reviews ESP block activity at the sub-account level. When block activity exceeds healthy thresholds, HighLevel may send a warning email, temporarily pause email sending, or apply future enforcement if repeated issues continue.

Key Benefits of ESP Block Monitoring

ESP block monitoring helps identify deliverability risks early and gives users time to correct sending issues before they cause long-term reputation damage.

Sender Reputation Protection: Helps prevent continued sending when mailbox providers are rejecting emails.
Improved Deliverability: Reduces harmful sending signals that can affect inbox placement.
Early Warning: Notifies users before email sending is temporarily paused.
Platform Protection: Helps protect shared email infrastructure across HighLevel.
Automatic Enforcement: Works automatically without manual setup.

How ESP Block Enforcement Works

Progressive enforcement gives users time to correct email sending issues before stronger restrictions are applied. The process starts with a warning and may move to temporary sending pauses if ESP block activity continues.

HighLevel may apply enforcement in this order:

A warning email is sent when ESP block activity rises above healthy levels.
If excessive blocks continue, email sending may be paused for 12 hours.
If the issue happens again, email sending may be paused for 24 hours.
In a future enforcement phase, repeated suspension occurrences may lead to permanent suspension of email sending capability for the affected sub-account.

Warning Email: Risk of Suspension

A warning email is sent when ESP block activity rises above healthy levels. This gives you time to review your email setup, sending volume, and contact quality before sending is paused.

The warning email may include:

Your current Email Service Provider block rate
The recommended healthy threshold
Why mailbox providers may be blocking emails
Recommended next steps
A link to an ESP block resolution guide

12-Hour Temporary Suspension

If excessive ESP blocks continue after the warning, email sending for the affected sub-account may be paused for 12 hours. Sending resumes automatically after the suspension window ends.

During the 12-hour suspension:

Email sending is temporarily disabled for the affected sub-account
.
A suspension notification email is sent.
The account may show an in-app warning banner
.
The banner may show when email services are expected to resume.

The in-app banner appears inside HighLevel when email sending is blocked due to a high number of spam blocks from email providers. This helps users quickly identify why sending is unavailable.

The banner may show:

That email sending is blocked
The reason sending is blocked
The expected resume time
A Learn more button

24-Hour Temporary Suspension

Repeated ESP block issues can indicate that the original sending problem was not fully resolved. A longer suspension gives the account more time to correct the cause before sending resumes.

If ESP block issues happen again after the first temporary suspension, email sending for the affected sub-account may be paused for 24 hours.

Use this time to:

Review email analytics
Confirm SPF, DKIM, and DMARC are configured correctly
Reduce send volume
Send only to engaged contacts
Clean inactive or low-quality contacts from your lists

Future Enforcement: Permanent Suspension

Permanent enforcement is intended to protect sender reputation and platform-wide deliverability when repeated ESP block issues continue after temporary pauses. Agencies will be notified before permanent enforcement is implemented.

In a future phase, if a sub-account experiences repeated suspension occurrences, email sending capability for that sub-account may be permanently suspended.

How To Prevent ESP Block Enforcement

ESP block enforcement is automatic, so there is no setup required. The best way to avoid warnings or suspensions is to maintain healthy sending practices.

To reduce ESP blocks:

Confirm SPF, DKIM, and DMARC are configured correctly.
Send to engaged contacts first.
Avoid sudden increases in sending volume.
Remove invalid, inactive, bounced, or unengaged contacts.
Review email content for spam-like wording, broken links, or misleading subject lines.
Monitor email analytics and bounce classifications.
Reduce sending temporarily if ESP blocks increase.

What To Do If Your Email Sending Is Paused

A temporary pause means mailbox providers are rejecting too many emails from the sub-account. Use the pause window to correct the issue before sending resumes.

Recommended actions:

Stop non-essential campaigns.
Review recent sends and identify any volume spikes.
Check email authentication records.
Review ESP block categories in Email Analytics.
Clean your contact list.
Prioritize your most engaged contacts.
Resume sending carefully after the pause ends.

Frequently Asked Questions

Q: What is an ESP block?
An ESP block happens when a mailbox provider rejects an email due to deliverability, reputation, authentication, content, or engagement concerns.

Q: Is ESP block monitoring automatic?
Yes. ESP block monitoring is enabled automatically at the sub-account level.

Q: What happens after a warning email?
If ESP block activity continues, email sending may be temporarily paused.

Q: How long does the first suspension last?
The first temporary suspension lasts 12 hours.

Q: How long does a repeated suspension last?
Repeated ESP block issues may result in a 24-hour suspension.

Q: Does sending resume automatically?
Yes. Sending resumes automatically after the temporary suspension window ends.

Q: How can I reduce ESP blocks?
Review authentication, reduce send volume, clean your lists, improve email content, and send to engaged contacts.

Q: Can ESP block enforcement become permanent?
n a future phase, repeated suspension occurrences may lead to permanent email sending suspension for the affected sub-account.