Email Sender Reputation Recovery

How to restore inbox placement after a sending incident

Assess the Damage

Before you can recover, you need to understand exactly what was damaged and how severely.

Step 1: Check IP Reputation

  • Google Postmaster Tools - gmail.com/postmaster
  • Microsoft SNDS - snds.azurewebsites.net
  • MXToolbox IP reputation check
  • Talos Intelligence (cisco.com) - free IP check

Step 2: Check Blacklists

  • Spamhaus.org SBL/XBL/PBL lookup
  • SORBS.net
  • UCEPROTECT Level 1/2/3
  • MXToolbox Blacklist Check (all at once)

Step 3: Identify Root Cause

  • What triggered the issue?
  • Spam trap hit? (which type?)
  • Volume spike?
  • Content issue?
  • Authentication failure?

The 7-Day Emergency Recovery Plan

Day 1 - Stop the Bleeding

Immediately reduce volume to 10% of normal. Remove all problematic addresses. Fix authentication if broken.

Day 2 - Remove Bad Addresses

Scrub hard bounces, spam trap hits, and complainers from your list. Clean list thoroughly before sending more.

Day 3 - Submit Blacklist Removal

If blacklisted, submit removal requests to all relevant blocklists. Provide evidence of fix.

Day 4-5 - Gradual Warmup

Begin sending to your cleanest, most engaged addresses only. Keep volume very low.

Day 6-7 - Monitor Metrics

Watch bounce rates closely. If under control, slowly increase volume. If metrics degrade, pause and investigate.

⚠️ Patience is Essential

Reputation recovery takes time. Rushing back to full volume will re-trigger the problem. A slow recovery is better than no recovery.

Rebuilding Domain Reputation

If Domain is Flagged

  • Domain reputation takes 2-4 weeks to rebuild
  • Use a different subdomain for sending (e.g., mail.yourdomain.com)
  • Register new domains if needed for testing
  • Implement strict authentication on new domains

Accelerate with Good Sending

✅ The Good Sending Acceleration

Consistent good sending rebuilds reputation faster than pausing. Send to highly engaged recipients who open and reply. Each positive engagement signal helps.

What to Send During Recovery

  • Existing customers only
  • Recent engagers (opened in last 30 days)
  • Short, simple content
  • Avoid promotional language
  • Focus on reply-eliciting content

Prevention Going Forward

Essential Safeguards

  • Volume caps - Never exceed 3x normal volume in 24 hours
  • Bounce monitoring - Alert at 0.3%, stop at 0.5%
  • Daily list cleaning - Remove bounces within 24 hours
  • Auth monitoring - Check SPF/DKIM/DMARC daily
  • Postmaster review - Weekly check of ISP postmaster tools

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