Blocked

What is it?

What is it?

When an email is "Blocked," the receiving server prevents the message from reaching the recipient's inbox. This action can be a result of various factors, including the sender's IP being on a blacklist, failure of email authentication checks, or the email content triggering spam filters. Unlike a soft or hard bounce, where the sender is notified, a block may not always result in a bounce message, making it harder to identify and resolve.

Key points to remember

Key points to remember

  • Silent Failure: Blocks can occur without the sender's knowledge, as not all email systems notify the sender when an email is blocked.

  • Reputation Impact: Frequent blocks can harm a sender's reputation, leading to more widespread deliverability issues.


  • Content and List Management: Regularly reviewing email content for potential spam triggers and maintaining a clean email list are essential to avoiding blocks.


  • Authentication is Crucial: Properly setting up SPF, DKIM, and DMARC can help prevent blocks by verifying the sender's identity.


  • Monitor Deliverability: Using tools that monitor email deliverability and reputation can help identify and address blocks proactively.

Example of Use

Example of Use

  1. Deliverability Monitoring: An email marketer uses a deliverability service to identify messages blocked by a major ISP, prompting an investigation into email practices and content.


  2. Content Review: After noticing decreased engagement, a newsletter publisher reviews their email content for spam-like characteristics and adjusts to avoid future blocks.

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