Carrier filtering (Error 30007) occurs when messages are blocked because they appear to be unwanted, spammy, or non-compliant with carrier or legal policies. This article will help you understand what message filtering is, how to avoid it, and what you can do if you're affected.

TABLE OF CONTENTS

• What is Error 30007 – Carrier Filtering?
• How to Prevent Messages from Being Filtered
  • 1. Consent and Opt-In
  • 2. Use Case & Sender Selection
  • 3. Message Content & Formatting
  • 4. Opt-Out & Compliance Requirements
  • 5. Monitoring & DND Handling
• Think You’re Being Filtered by Mistake?
• Frequently Asked Questions
• Related Articles

What is Error 30007 – Carrier Filtering?

30007 is a carrier-side error that indicates your message was filtered due to content, sender identity, or compliance reasons.

This happens when a message:

• Violates a carrier’s messaging policy.
  
  
• Appears similar to spam or illegal traffic.
  
  
• Is missing required compliance elements, like opt-in consent or sender identification.

These filters are enforced to protect consumers, comply with national regulations (like A2P 10DLC in the U.S.), and maintain platform trust.

If you want more information on message filtering, please check out this article: How Does Message Filtering Work? 

How to Prevent Messages from Being Filtered

Below are structured guidelines based on carrier requirements, HighLevel's policies, and industry best practices.

1. Consent and Opt-In

• Only message users who’ve explicitly opted in.
  
  
• Your message must identify the sender and include opt-out instructions.
  
  
• You must include STOP language at least once every 30 days if you message the same contact regularly.
  
  
• Avoid creative variations like “Reply 2 to unsubscribe” – these are non-compliant and will be filtered.
  
  
• Reconfirm opt-in every 18 months to avoid accidental messaging of recycled numbers.
  
  
• Monitor opt-out rates and complaint spikes, carriers will begin filtering traffic that shows abuse patterns.

2. Use Case & Sender Selection

• Avoid forbidden use cases, such as payday loans, debt relief, cannabis, etc.
  
  Checkout our guide on - Forbidden message categories for SMS and MMS in the US and Canada.
  
  
• Do not “snowshoe” across multiple numbers to evade filtering – use numbers based on geography or business units only.
  
  
• Use pre-registered short codes or Alphanumeric Sender IDs where required, especially for countries like France.
  
  
• Refer to SMS Guidelines by Country for local rules.

3. Message Content & Formatting

• Avoid public URL shorteners (like Bitly, TinyURL). Use branded domains like (yourbusiness.com/offer).
  
  
• Never use obfuscated links or suspicious redirects.
  
  
• Use clear, well-written language and avoid,
  
  
  1. Emojis, excessive punctuation, or CAPS.
     
     
  2. Misspellings or poor grammar.
     
     
• Do not send illegal or misleading content, or anything listed in the Forbidden Categories link above.

4. Opt-Out & Compliance Requirements

Your SMS must:

• Contain STOP instructions (at least monthly).
  
  
• Clearly name the sender.
  
  
• Be sent only to users who gave explicit permission.

5. Monitoring & DND Handling

• Process DND (Do Not Disturb) requests daily – deactivated numbers are no longer valid recipients.
  
  
• A message triggering 30007 can mark a contact as DND automatically.

Learn more about: DoNotDisturb (DND Split) 

Think You’re Being Filtered by Mistake?

If your messages meet all compliance criteria but are still blocked:

1. Gather 3+ contact examples from the past 7 days that show error 30007.
   
   
2. Share the links with our Support team for review.

How to Share Contact Links:

1. Go to Conversations from your sub-account
   
   
2. Use the Search bar to find the affected contact by Name or Number.
   
   
3. Click on the Contact Image to open contact details.
   
   
   
4. Copy the browser URL, that will look like:
   
   https://app.gohighlevel.com/location/<LOCATION_ID>/conversations/<CONTACT_ID>
   
   

Frequently Asked Questions

Q: Why does message filtering vary between carriers?
Each carrier uses different filtering logic and algorithms. A message blocked by one carrier (e.g., Verizon) might be delivered by another (e.g., AT&T), depending on the content, volume, and sender history.

Q: What if I’m messaging international numbers?
Each country has different SMS rules. Some require specific sender types (e.g., short codes or alpha IDs), and others restrict certain industries.

Q: How do I know if a contact was marked DND because of 30007?
You can check their conversation status, error logs, and delivery error codes. If they are in DND, and messages were previously filtered, it's likely related.

Q: Will repeated 30007 errors block my number permanently?
It can lead to DND status, restriction, or even number deactivation if unresolved.

Q: How can I test if my messages will be filtered?
There’s no test tool, but following best practices significantly reduces the risk.

Q: Do I need A2P 10DLC if I only send to a small list?
Yes. Any U.S.-bound SMS traffic must comply with A2P 10DLC registration.

Q: Can I use emojis or shortened links?
Best to avoid both. Use only branded URLs and standard language formatting.

Related Articles

• LC - Phone Messaging Policy 
  
  
• Best Practices for SMS Deliverability
  
  
• SMS Restriction History
  
  
• Configuring Sender ID and Opt-Out Language for SMS Compliance
  
  
• Common Unsuccessful SMS errors
  
  
• SMS Not Sending / Delivering to Contacts