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Guides, strategies, and deep dives on AI, deliverability, automation, and growing your audience.
Email headers are a stack of metadata appended every time a message hops between servers. This is a developer-focused walkthrough of how to parse Received lines, what each token means, and how to reconstruct a message's full delivery path from raw text.
A practical, opinionated walkthrough of the three DNS records your app needs to send transactional or product email that doesn't land in spam. Written for developers who would rather ship than read RFCs.
The CAN-SPAM Act sets seven rules for commercial email sent to US recipients, from accurate headers to a working opt-out honored within 10 business days. This post is general information, not legal advice; the FTC can fine you up to $51,744 per offending email.
The CCPA (as amended by the CPRA) gives California residents rights to know, delete, correct, and opt out of the sale or sharing of their personal information. Email addresses count as personal information; this guide explains what email marketers actually need to do. Not legal advice.
AMP for email turns a static message into an interactive web app inside the inbox, letting subscribers submit forms, browse carousels, and update data without leaving Gmail. Support is limited to Gmail, Yahoo, and Mail.ru, so fallback HTML still matters.
Transactional vs marketing email comes down to purpose and consent; a transactional email completes a transaction the recipient already started (a receipt, a password reset), while a marketing email promotes something. They need different infrastructure, different consent, and different legal treatment under CAN-SPAM and GDPR.
Email list hygiene is the ongoing practice of removing bad addresses (hard bounces, role-based, spam traps, long-term inactives) from your sending list so real subscribers see your mail. A quarterly cleanup routine typically pulls bounce rates below 1% and lifts inbox placement 10 to 20 points.
Email warmup is the deliberate practice of sending small, gradually increasing volumes from a new domain or IP so mailbox providers can build a trust score before you hit full send. Skip it and your first real campaign lands in spam. Do it right and you start your sending history on a clean slate.
Email bounce rates measure the percentage of messages that fail to reach recipients. Hard bounces are permanent failures from invalid addresses; soft bounces are temporary (full mailbox, oversized message). A healthy bounce rate sits under 2%; anything above 5% puts sender reputation at risk.
Email psychology is the study of the mental shortcuts and emotions that decide whether someone opens, clicks, or ignores an email. Curiosity, self-interest, social proof, urgency, and reciprocity explain most of the behavior; the inbox is a fast-thinking environment where subject lines are persuasion decisions made in under a second.
GDPR email marketing requires freely given, specific, informed, and unambiguous consent from EU and UK residents before you send commercial email. This is general information, not legal advice; consult counsel for your specific case. Fines reach 20 million euros or 4% of global turnover.
Cold email vs warm email comes down to consent and context. Cold email targets strangers for B2B outreach (response rates of 1-5%); warm email nurtures opted-in subscribers (open rates of 20-40%). Each has different legal rules, different metrics, and different tools.
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