Technical guides written by people who actually run SMTP servers.
GDPR is not new, but its interpretation for transactional email tightened in 2024-2025. Consent rules, data minimisation, DPAs and EU-US transfer mechanisms — here is what matters now.
In June 2022 HBO Max accidentally sent an email titled "Integration Test #1" to a wide swath of customers. The incident is a near-perfect case study in how multi-tenant senders go wrong.
Since iOS 15, Apple Mail pre-fetches every tracking pixel, so open rates from Apple users became fiction. Here is how to rebuild meaningful engagement metrics.
WP Mail SMTP, Fluent SMTP, Post SMTP, Easy WP SMTP: which one for which situation? Honest comparison with real setup walkthroughs.
Gmail Postmaster Tools shows the data Gmail uses to decide whether your mail reaches the inbox or the spam folder. Here is how to read every chart without panicking.
You have SPF, DKIM and DMARC. Great. But the TLS connection between mail servers is still optional and can be downgraded silently. MTA-STS and TLS-RPT fix that.
Most teams misread SMTP bounce codes and end up retrying messages that will never deliver, or worse, killing their sender reputation. Here is what those three-digit numbers actually mean.