Articles & Guides
Useful resources for web developers and system administrators
Found 25 · Infrastructure · Reset
Infrastructure
Email on Your Own Domain: Setup, Website Sending and Migration Without Losing Mail
How to set up email on your own domain: domain verification, MX, SPF, DKIM and DMARC, sending website mail over SMTP, and migrating providers without losing messages.
Infrastructure
How to Choose Web Hosting: Criteria, Pre-Purchase Checks, Red Flags
How to choose web hosting: shared vs VPS vs dedicated vs cloud, hidden shared-plan limits (inodes, CPU seconds), backup and SLA math in real downtime minutes, measuring TTFB before you pay, contract red flags, and a 12-point vendor-neutral checklist.
Infrastructure
Email Not Arriving: A Checklist for Senders and Recipients
Email not arriving? A step-by-step checklist for senders and recipients: Spam folder, SPF, DKIM, DMARC, MX records, blacklists, bounce codes 550, 552, 554, greylisting. Includes a symptom-cause-fix table, dig commands, and answers to common questions.
Infrastructure
How to Check If an Email Address Exists
Three levels of email verification: syntax, MX records, SMTP probe — and why a 100% check without sending is impossible. How to verify safely.
Infrastructure
Warming Up a Sending Domain
Warm up a sending domain and IP for email: a day-by-day volume schedule, gradual ramp, starting with your most engaged subscribers, and reputation monitoring.
Infrastructure
Transactional Email Deliverability
How to make transactional email land: a dedicated subdomain, SPF/DKIM/DMARC, stream separation, and MX/SMTP monitoring — practical, battle-tested rules.
Infrastructure
Why Emails Bounce: Codes and Causes
Why emails bounce: SMTP 5xx and 4xx codes explained, the real causes — bad address, reputation block, SPF/DKIM/DMARC failure — and how to fix each one.
Infrastructure
Email Bounce Handling: Hard vs Soft
How to handle email bounces: the hard vs soft difference, SMTP 4xx and 5xx codes, suppression-list rules and automation to protect your sender reputation.
Infrastructure
Multi-CDN Strategy: Failover, Cost Optimization, and Traffic Splitting
A comprehensive guide to implementing multi-CDN architecture for improved reliability, lower latency, cost optimization, and intelligent traffic splitting across CDN providers.
Infrastructure
API Versioning Strategies: URL, Header, and Query Parameter Approaches
Compare API versioning methods including URL path, custom headers, and query parameters. Learn best practices for backward compatibility and deprecation workflows.