How does usage work?

Last updated: April 12, 2026

Last Updated: April 12, 2026

Customer-Facing Guide

Overview

Sendblue usage is primarily based on the number of new contacts you add. A new contact is a phone number that has never been contacted before on Sendblue.

How counting works

  • The first time you contact a brand-new phone number, it counts toward your daily new-contact capacity.

  • Once that phone number already exists as a contacted recipient, ongoing messages to that same contact do not keep re-counting as new usage.

Best-practice limits

  • Keep new contacts per line to about 50 or fewer per day.

  • As a general best-practice guideline, keep total daily conversations per line around 150 or fewer.

  • Spread new outreach across the day instead of bunching it into a short burst.

Why pacing matters

Hitting a daily limit is not the same thing as sending too aggressively in a short window. Even if daily totals look acceptable, bursty traffic can still hurt line health.

How to monitor it

  • Track how many new contacts are being added each day.

  • Review whether outreach is evenly distributed or hitting in concentrated bursts.

  • If you keep reaching the ceiling, consider whether traffic should be spread across more lines or different timing windows.

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