Insights on cold email, deliverability, and scaling your outreach infrastructure.
An inbox placement seed test shows whether cold email lands in inbox, spam, or Promotions across Gmail, Outlook, and Yahoo. How to build, run, and read one.
Email spam traps explained: how pristine, recycled, and typo traps work, why one hit can blocklist your domain, and the 12-month rule behind recycled traps.
Microsoft SNDS setup is free and IP-based. Authorize your sending IPs, then read the green/yellow/red filter-result column and act before you hit red.
Google Postmaster Tools setup takes one DNS TXT record that verifies in minutes. Learn to read every dashboard panel and keep your Gmail spam rate under 0.3%.
Listed on Spamhaus? CSS entries clear about three days after the last spam hit, but only if you fix the cause first. Here's the full delisting playbook.
Learn how to check if your domain is blacklisted with free DNSBL tools, read each 127.0.0.x listing code, and tell a real Spamhaus block from harmless noise.
Plain text vs HTML email deliverability, decoded: HTML itself scores ~0.001 in SpamAssassin. The real penalties come from images, hidden text, and bloat.
Dedicated IP vs shared IP for cold email: most senders should stay on managed shared pools. A dedicated IP only pays off above ~100,000 steady emails a year.
Read DMARC aggregate reports: decode the XML, spot the alignment trap where SPF passes but DMARC fails, and find unauthorized senders sending as your domain.
