Why did my Sendblue line get blocked?

Last updated: April 12, 2026

Last Updated: April 12, 2026

Customer-Facing Guide

Overview

A blocked or degraded line usually comes from some combination of poor engagement, aggressive pacing, spam-like content patterns, or sending rich content too early.

Most common causes

  • Recipients mark messages as junk or spam.

  • Too many follow-ups without a response.

  • Cold or weak-consent outreach.

  • High message volume in a short window.

  • Links or media sent before the recipient engages.

  • Repetitive or unnatural copy that looks automated.

How to reduce future risk

  • Keep first outreach short and conversational.

  • Do not send links or media until after a reply.

  • Spread traffic across the day rather than blasting.

  • Follow up strategically instead of repeatedly pushing the same lead.

  • Honor opt-outs immediately.

What to do if you think a line is already blocked

  1. Stop guessing and gather a few concrete examples.

  2. Check whether the issue is isolated to one line.

  3. Review usage/pacing and recent messaging behavior.

  4. Contact support with the affected line, example failures, and approximate timing.

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