WhatsApp Sender Warm-Up Best Practices

New WhatsApp senders should be warmed up gradually before running large-volume campaigns. This helps build sender reputation and reduces the likelihood of quality issues, delivery restrictions, or account flagging.

Recommended 7-Day Warm-Up Approach

Day 1

Send to 50–100 highly engaged contacts only. Focus on:

  • Recent buyers
  • Active leads
  • Recent responders

Day 2–3

Gradually increase volume if delivery quality remains healthy. Continue prioritizing engaged audiences and avoid broad campaign sends.

Day 4–5

Expand carefully into slightly broader but still relevant audience segments. Do not scale aggressively if engagement begins to decline.

Day 6–7

Move toward normal campaign volumes only if:

  • Delivery rates remain healthy
  • Block rates stay low
  • Engagement quality is stable

Important Warm-Up Rules

During the warm-up period:

  • Increase send volumes gradually
  • Prioritize high-quality opted-in contacts
  • Avoid inactive or cold databases
  • Use approved templates where required
  • Monitor quality signals closely after every send

If sender quality begins to decline, pause scaling immediately and review campaign targeting and content relevance.

Monitor Campaign Performance

After every campaign, monitor key engagement and quality metrics, including:

  • Delivery rate
  • Read rate
  • Reply rate
  • Opt-outs
  • Blocks and complaints

A sudden drop in engagement or increase in complaints may indicate poor targeting, excessive frequency, or low message relevance.

Quick Go / No-Go Check

Do not send a campaign unless all of the following are true:

  • The audience has valid opt-in
  • The correct template is being used where required
  • The message is relevant to the audience
  • The sender has been warmed up appropriately
  • An internal test send has been completed
  • A post-send monitoring plan is in place
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