Why do safety thresholds pause email campaigns automatically, and how do they protect sender IP reputation?

Email Deliverability
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Our email campaign was automatically paused by the platform safety guardrails. What triggers safety thresholds on campaigns, and how does campaign pausing differ for transactional vs bulk marketing mail?

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Understanding AutoSend Safety Circuit Breakers

When sending marketing or transactional emails, mail servers like Google, Yahoo, and Outlook monitor real-time bounce and complaint rates per sending domain. AutoSend includes automated safety thresholds that temporarily pause a campaign if metric spikes threaten your domain reputation.

What Triggers an Automatic Campaign Pause?

  1. Hard Bounce Rate > 3%–5%: Sending to invalid or dead email addresses (common with old or unverified user lists).
  2. Spam Complaint Rate > 0.1%: When 1 out of 1,000 recipients marks the email as spam (Google’s strict enforcement threshold).
  3. High Spam Trap Hits: Ingesting un-validated web form submissions.

Why Safety Thresholds Protect Your Infrastructure

  • Domain Protection: If a campaign continues blasting after hitting a 5% bounce rate, major ISPs will place your entire domain on global blocklists (like Spamhaus), crippling your transactional mail (OTPs, password resets).
  • Automatic Pause vs Account Ban: The pause halts only the problematic batch so you can scrub your list without affecting live transactional routes.

Recommended Remediation Steps

  1. Scrub Email Lists: Run email verification tools (like NeverBounce or ZeroBounce) before uploading bulk lists.
  2. Enable Double Opt-In: Verify recipient addresses on signup forms to keep unverified contacts out of active campaigns.
  3. Separate Subdomains: Route transactional mail through auth.yourdomain.com and marketing sequences through news.yourdomain.com.

Relevant Documentation