Password-Protect a Directory with .htaccess: Basic Auth, APR1-MD5, and bcrypt
Basic Auth, .htaccess/.htpasswd, file permissions, and APR1-MD5 vs bcrypt hashing: everything you need to protect a sensitive directory on Apache or nginx.
Authentication
Email sender authentication methods and identity verification.
9 articles
August 2026
February 2026
NIST 2025 password recommendations: what's changed
The NIST has rewritten its password rules. No more mandatory rotation, no more complexity requirements. A complete breakdown of SP 800-63B-4 with a step-by-step compliance plan.
Passphrase vs password: which one is actually safer?
A 16-character random password or a 5-word dice-generated phrase? A technical comparison with entropy calculations, use cases, and practical recommendations.
Passkeys vs passwords: should you ditch your passwords in 2025?
Google, Apple, and Microsoft are pushing passkeys as the replacement for passwords. But are they ready for widespread use? Technical comparison, benefits, limitations, and transition strategy.
January 2026
Mandrill (Mailchimp Transactional): Technical Guide for Transactional Email
A complete guide for developers and system admins: DKIM configuration via CNAME, choosing between API and SMTP, Mailchimp prerequisites, and pitfalls to avoid.
Mailgun: Complete Technical Guide for Transactional Email
A detailed technical guide for developers: DNS configuration (SPF, 2048-bit DKIM with autorotation), REST API vs SMTP, dedicated vs shared IP, limits and webhooks.
Amazon SES: Complete Guide to DNS Configuration and Email Authentication
Complete Amazon SES configuration with Easy DKIM, Custom MAIL FROM, strict DMARC alignment. Everything you need for optimal deliverability and GDPR compliance.
Mailjet: Complete Technical Guide for Transactional Email in 2026
A comprehensive guide for developers and system admins: DKIM configuration, API v3 vs v3.1, dedicated vs shared IP, and pitfalls to avoid with Mailjet.
Brevo (formerly Sendinblue): Technical Guide for Transactional Emailing
A comprehensive guide for developers and sysadmins: DKIM configuration, choosing between API and SMTP, technical limits, and pitfalls to avoid with Brevo.