MailCheck Blog
Technical guides on email verification, deliverability, and authentication.
Why EU-Based Email Verification Matters (GDPR Compliance)
A comprehensive guide to GDPR compliance for email verification — why data residency matters, how Schrems II affects US-based APIs, and practical steps for compliant implementation.
How to Check if an Email Address is Valid (With Code Examples)
Learn how to validate email addresses beyond regex — syntax checks, DNS lookups, disposable detection, and real-time API verification with code examples.
Disposable Email Addresses: How to Detect and Block Them
Disposable emails hurt your data quality and enable abuse. Learn how to detect and block 5,000+ disposable email providers with a single API call.
SPF, DKIM, and DMARC Explained for Developers
A practical guide to email authentication protocols — what SPF, DKIM, and DMARC do, how to check them programmatically, and why they matter for deliverability.
Reduce Bounce Rate: Email Verification Best Practices
High bounce rates destroy sender reputation. Learn email verification best practices and how to integrate real-time verification into your signup and sending flows.
How Email Authentication Actually Works: SPF, DKIM & DMARC Explained
A developer-focused deep dive into SPF, DKIM, and DMARC — how they work together, common misconfigurations, and how to verify them programmatically.