When to Re-Run a Deliverability Test

Re-test after any change that can alter trust, routing, or message shape.

Always rerun after

  • DNS edits
  • ESP or SMTP provider changes
  • New link-tracking domain rollout
  • Template rebuilds
  • Attachment or payload-size changes

Often rerun after

  • Subject-line experiments
  • Sending-domain warm-up changes
  • New unsubscribe behavior

Small content edits do not always require full revalidation. Infrastructure and identity changes usually do.