Deliverability insights, straight from the team.
Practical guides on email verification, sender reputation, list hygiene, and authentication — everything we learn building the most affordable verification platform on the market.
Why Are My Emails Going to Spam? A Deliverability Checklist
Why are my emails going to spam? The four causes in the order Gmail, Yahoo, and Outlook weigh them, with the fail signal and fix for each in one checklist.
How to Move DMARC From p=none to p=reject Without Breaking Mail
A staged plan for moving DMARC from none to reject: pre-flight checks, reading aggregate reports, fixing unaligned senders, the pct ramp, sp= for subdomains, and what breaks.
7 ZeroBounce Alternatives Worth Testing in 2026
Comparing the best ZeroBounce alternatives for 2026 (Bouncer, NeverBounce, Kickbox, MillionVerifier and more), ranked by billing model, accuracy claims and real cost.
How to Block Disposable Email Addresses at Signup (3 Approaches)
How to block disposable email addresses at signup: regex vs maintained blocklist vs API, MX-based detection, and the privacy relays you must never block.
SPF, DKIM, and DMARC Explained (Without the Jargon)
SPF, DKIM, and DMARC explained the way practitioners use them: what each protocol does, how alignment binds them, and why Gmail and Yahoo require all three.
How to Clean Your Email List in Mailchimp Before It Costs You
Mailchimp bills for unsubscribed contacts and only cleans addresses after they bounce. Here's how to use its own tools, then verify the export before re-import.
Catch-All Email Verification: Why 'Valid' Sometimes Lies
Catch-all domains accept mail for every address, so basic SMTP checks call dead mailboxes 'valid.' The mechanic behind it, and how to segment without losing leads.
What's an Acceptable Email Bounce Rate? The 0.3% Myth
An acceptable email bounce rate sits under 2%, under 1% on a well-kept list. The healthy bands, why 0.3% is really Gmail's spam rate, and how to stay low.
Email Verification Guide: How It Works, Stage by Stage
An email verification guide for outbound teams: syntax, MX, the SMTP probe, catch-all and disposable checks, reading each result, and what billing really costs.