Complete Email Deliverability Recovery Guide

🔍 Root Cause Diagnosis

First, identify why emails are landing in spam. Check each category below.

🔐 Authentication issues (#1 culprit)

• Missing or broken SPF records
  • Your domain cannot prove you are authorized to send emails, so providers assume spam.
• DKIM not set up
  • No cryptographic signature means ISPs think the email might be tampered with.
• DMARC policy problems
  • Missing DMARC or misaligned SPF and DKIM causing authentication failures.
• Domain or IP mismatch
  • Sending from IPs that do not match authentication records.

💥 Reputation disasters

• IP address blacklisted
  • Your sending IP is on spam blacklists from previous abuse.
• Domain reputation poisoned
  • Your domain is flagged due to spam complaints or bad content.
• Email service provider issues
  • Using a bulk email service that spammers have abused.
• New domain or IP warmup failure
  • Sending high volume immediately without building trust.

📉 Engagement death spiral

• Low open rates (below 10%)
  • ISPs interpret consistent low opens as unwanted mail.
• High spam complaint rates
  • Even 0.1% complaints can trigger filtering. Above 0.3% is a disaster.
• Poor click-through rates
  • Low engagement signals content is not valuable.
• Immediate deletes
  • People consistently delete emails without reading.

🚩 Content red flags